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"Eugenics is the self-direction of human evolution": Logo from the Second International Congress of Eugenics, 1921, depicting it as a tree which unites a variety of different fields.

Eugenics is a social philosophy which advocates the improvement of human hereditary traits through various forms of intervention. The purported goals have variously been to create healthier, more intelligent people, save society's resources, and lessen human suffering. Earlier proposed means of achieving these goals focused on selective breeding while modern ones focus on prenatal testing and fetal screening genetic counseling, birth control, in vitro fertilization, and genetic engineering. Critics argue that eugenics was and still is a pseudoscience. Historically, eugenics has been used as a justification for coercive state-sponsored discrimination and severe human rights violations, such as forced sterilization (e.g., of those perceived to have mental or social defects) and even genocide.

Selective breeding of human beings was suggested at least as far back as Plato, but the modern field was first formulated by Sir Francis Galton in 1865, drawing on the recent work of his cousin, Charles Darwin. From its inception, eugenics (derived from the Greek "well born" or "good breeding") was supported by prominent thinkers, including Alexander Graham Bell, George Bernard Shaw, and Winston Churchill]], and was an academic discipline at many colleges and universities. Its scientific reputation tumbled in the 1930s, a time when Ernst Rdin began incorporating eugenic rhetoric into the racial policy of Nazi Germany During the postwar period both the public and the scientific community largely associated eugenics with Nazi abuses, which included enforced "racial hygiene" and extermination, although a variety of regional and national governments maintained eugenic programs until the 1970s.

Definitions of the term vary. The term eugenics is often used to refer to a movement and social policy that was influential during the first half of the twentieth century. In an historical and broader sense, eugenics can also be a study of "improving human genetic qualities". It is sometimes more broadly applied to describe any human action whose goal is to improve the gene pool. Some forms of infanticide in ancient societies, present-day reprogenetics, pre-emptive abortions and designer babies have been (sometimes controversially) referred to as eugenics.

Because of its normative goals and historical association with scientific racism, as well as the development of the science of genetics, the international scientific community has mostly disassociated itself from the term "eugenics", sometimes referring to it as a pseudo-science, although one can find advocates of what is now known as liberal eugenics. Modern inquiries into the potential use of genetic engineering have led to an increased invocation of the history of eugenics in discussions of bioethics, most often as a cautionary tale. Some ethicists suggest that even non-coercive eugenics programs would be inherently unethical, though this view has been challenged by such thinkers as Nicholas Agar.[1]

Eugenicists advocate specific policies that (if successful) would lead to a perceived improvement of the human gene pool. Since defining what improvements are desired or beneficial is arguably a cultural choice rather than a matter that can be determined objectively (e.g. by empirical, scientific inquiry), eugenics has been deemed pseudo-science by many. The most disputed aspect of eugenics has been the definition of "improvement" of the human gene pool, such as what is a beneficial characteristic and what is a defect. This aspect of eugenics has historically been tainted with scientific racism.

Early eugenicists were mostly concerned with perceived intelligence factors that often correlated strongly with social class. Many eugenicists took inspiration from the selective breeding of animals (where purebreeds are often strived for) as their analogy for improving human society. The mixing of races (or miscegenation) was usually considered as something to be avoided in the name of racial purity. At the time, this concept appeared to have some scientific support, and it remained a contentious issue until the advanced development of genetics led to a scientific consensus that the division of the human species into unequal races is unjustifiable.

Eugenics has also been concerned with the elimination of hereditary diseases such as haemophilia and Huntington's disease. However, there are several problems with labeling certain factors as "genetic defects":

Similar concerns have been raised when a prenatal diagnosis of a congenital disorder leads to abortion (see also preimplantation genetic diagnosis).

Eugenic policies have been historically divided into two categories: positive eugenics, which encourage a designated "most fit" to reproduce more often, and negative eugenics, which discourage or prevent a designated "less fit" from reproducing. Negative eugenics need not always be coercive. A state might offer financial rewards to certain people who submit to sterilization, although some critics might reply that this incentive along with social pressure could be perceived as coercion. Positive eugenics can also be coercive. Abortion by "fit" women was illegal in Nazi Germany.

During the twentieth century, many countries enacted various eugenics policies and programs, including:

Most of these policies were later regarded as coercive, restrictive, or genocidal, and now few jurisdictions implement policies that are explicitly labeled as eugenic, or unequivically eugenenic in substance (however labeled). However, some private organizations assist people in genetic counseling, and reprogenetics may be considered as a form of non state-enforced, "liberal" eugenics.

Selective breeding was suggested at least as far back as Plato, who believed human reproduction should be controlled by government. He recorded these views in The Republic. "The best men must have intercourse with the best women as frequently as possible, and the opposite is true of the very inferior." Plato proposed that selection be performed by a fake lottery so people's feelings would not be hurt by any awareness of selection principles. Other ancient examples include the city of Sparta's purported practice of leaving weak babies outside of city borders to die.

Sir Francis Galton initially developed the ideas of eugenics.

During the 1860s and 1870s Sir Francis Galton systematized these ideas and practices according to new knowledge about the evolution of man and animals provided by the theory of his cousin Charles Darwin. After reading Darwin's Origin of Species, Galton noticed an interpretation of Darwin's work whereby the mechanisms of natural selection were potentially thwarted by human civilization. He reasoned that, since many human societies sought to protect the underprivileged and weak, those societies were at odds with the natural selection responsible for extinction of the weakest. Only by changing these social policies, Galton thought, could society be saved from a "reversion towards mediocrity," a phrase that he first coined in statistics, and which later changed to the now common, "regression towards the mean."[2]

Galton first sketched out his theory in the 1865 article "Hereditary Talent and Character," then elaborated it further in his 1869 book Hereditary Genius.[3] He began by studying the way in which human intellectual, moral, and personality traits tended to run in families. Galton's basic argument was that "genius" and "talent" were hereditary traits in humans (although neither he nor Darwin yet had a working model of this type of heredity). He concluded that, since one could use artificial selection to exaggerate traits in other animals, one could expect similar results when applying such models to humans. As he wrote in the introduction to Hereditary Genius:

According to Galton, society already encouraged dysgenic conditions, claiming that the less intelligent were out-reproducing the more intelligent. Galton did not propose any selection methods: rather, he hoped that a solution would be found if social mores changed in a way that encouraged people to see the importance of breeding.

Galton first used the word eugenic in his 1883 Inquiries into Human Faculty and Its Development, a book in which he meant "to touch on various topics more or less connected with that of the cultivation of race, or, as we might call it, with 'eugenic' questions." He included a footnote to the word "eugenic" which read:

In 1904 he clarified his definition of eugenics as:

Galton's formulation of eugenics was based on a strong statistical approach, influenced heavily by Adolphe Quetelet's "social physics." Unlike Quetelet however, Galton did not exhalt the "average man," but decried him as mediocre. Galton and his statistical heir Karl Pearson developed what was called the biometrical approach to eugenics, which developed new and complex statistical models (later exported to wholly different fields) to describe the heredity of traits. However, with the re-discovery of Gregor Mendel's hereditary laws, two separate camps of eugenics advocates emerged. One was made up of statisticians, the other of biologists. Statisticians thought the biologists had exceptionally crude mathematical models while biologists thought the statisticians knew little about biology.[7]

Eugenics eventually referred to human selective reproduction with an intent to create children with desirable traits, generally through the approach of influencing differential birth rates. These policies were mostly divided into two categories: Positive eugenics, the increased reproduction of those seen to have advantageous hereditary traits and negative eugenics, the discouragment of reproduction by those with hereditary traits perceived as poor. Negative eugenic policies in the past have ranged from attempts at segregation to sterilization and even genocide. Positive eugenic policies have typically taken the form of awards or bonuses for "fit" parents who have another child. Relatively innocuous practices like marriage counseling had early links with eugenic ideology.

Eugenics differed from what would later be known as Social Darwinism. While both claimed intelligence was hereditary, eugenics asserted that new policies were needed to actively change the status quo towards a more "eugenic" state, while the Social Darwinists argued society itself would naturally "check" the problem of "dysgenics" if no welfare policies were in place (for example, the poor might reproduce more but would have higher mortality rates).

State policies in some Latin American countries advocated the whitening of society by increased European immigration and the eradication of indigenous populations. This can be seen particularly in Brazil and Argentina; in these countries, this process is known as branqueamento and blanqueamiento, respectively.

One of the earliest modern advocates of eugenic ideas (before they were labeled as such) was Alexander Graham Bell. In 1881 Bell investigated the rate of deafness on Martha's Vineyard, Mass. From this he concluded that deafness was hereditary in nature and recommended a marriage prohibition against the deaf ("Memoir upon the formation of a deaf variety of the human Race"). Like many other early eugenicists he proposed controlling immigration for the purpose of eugenics and warned that boarding schools for the deaf could possibly be considered as breeding places of a deaf human race.

Though eugenics is today often associated with racism, it was not always so; both W.E.B. DuBois and Marcus Garvey supported eugenics or ideas resembling eugenics as a way to reduce African American suffering and improve the stature of African Americans.

"We do not stand alone": Nazi poster from 1936 with flags of other countries with compulsory sterilization legislation.

Nazi Germany under Adolf Hitler was infamous for eugenics programs which attempted to maintain a "pure" German race through a series of programs which ran under the banner of "racial hygiene." Among other activities, the Nazis performed extensive experimentation on live human beings to test their genetic theories, ranging from simple measurement of physical characteristics to the more ghastly experiments carried out by Josef Mengele for Otmar von Verschuer on twins in the concentration camps. During the 1930s and 1940s the Nazi regime forcibly sterilized hundreds of thousands of people whom they viewed as mentally and physically "unfit", an estimated 400,000 between 1934 and 1937. The scale of the Nazi program prompted American eugenics advocates to seek an expansion of their program, with one complaining that 'the Germans are beating us at our own game."[8] The Nazis went further however, killing tens of thousands of the institutionalized disabled through compulsory "euthanasia" programs.[9]

Nazi propaganda for their compulsory "euthanasia" program: "This person suffering from hereditary defects costs the community 60,000 Reichsmark during his lifetime. Fellow German, that is your money, too."

They also implemented a number of "positive" eugenics policies, giving awards to "Aryan" women who had large numbers of children and encouraged a service in which "racially pure" single women were impregnated by SS officers (Lebensborn). Many of their concerns for eugenics and racial hygiene were also explicitly present in their systematic killing of millions of "undesirable" people including Jews, gypsies, Jehovah's Witnesses and homosexuals during the Holocaust (and much of the killing equipment and methods employed in the death camps were first developed in their euthanasia program). The scope and coercion involved in the German eugenics programs along with a strong use of the rhetoric of eugenics and so-called "racial science" throughout the regime created an indelible cultural association between eugenics and the Third Reich in the postwar years.[10]

The second largest eugenics movement was in the United States. Beginning with Connecticut in 1896 many states enacted marriage laws with eugenic criteria, prohibiting anyone who was "epileptic, imbecile or feeble-minded" from marrying. In 1898 Charles B. Davenport, a prominent American biologist began as director of a biological research station based in Cold Spring Harbor where he experimented with evolution in plants and animals. In 1904 Davenport received funds from the Carnegie Institution to found the Station for Experimental Evolution. The Eugenics Record Office opened in 1910 while Davenport and Harry H. Laughlin began to promote eugenics.[11]

A pedigree chart from The Kallikak Family meant to show how one "illicit tryst" could lead to an entire generation of "imbeciles".

In years to come the ERO collected a mass of family pedigrees and concluded that those who were unfit came from economically and socially poor backgrounds. Eugenicists such as Davenport, the psychologist Henry H. Goddard and the conservationist Madison Grant (all well respected in their time) began to lobby for various solutions to the problem of the "unfit" (Davenport favored immigration restriction and sterilization as primary methods, Goddard favored segregation in his The Kallikak Family, Grant favored all of the above and more, even entertaining the idea of extermination).[12] Though their methodology and research methods are now understood as highly flawed, at the time this was seen as legitimate scientific research. It did, however, have scientific detractors (notably Thomas Hunt Morgan, one of the few Mendelians to explicitly criticize eugenics), though most of these focused more on what they considered the crude methodology of eugenicists, and the characterization of almost every human characteristic as being hereditary, rather than the idea of eugenics itself.[13]

The idea of "genius" and "talent" is also considered by William Graham Sumner, a founder of the American Sociological Society (now called the American Sociological Association). He maintained that if the government did not meddle with the social policy of laissez faire, a class of genius would rise to the top of the system of social stratification, followed by a class of talent. Most of the rest of society would fit into the class of mediocrity. Those who were considered to be defective (mentally retarded, handicapped, etc.) had a negative effect on social progress by draining off necessary resources. They should be left on their own to sink or swim. But, those in the class of delinquent (criminals, deviants, etc.) should be eliminated from society. "Folkways," 1907.

In 1924, the Immigration Act of 1924 was passed, with eugenicists for the first time playing a central role in the Congressional debate as expert advisers on the threat of "inferior stock" from Eastern and Southern Europe. This reduced the number of immigrants from abroad to fifteen percent from previous years, to control the number of "unfit" individuals entering the country. The new Act strengthened existing laws prohibiting race mixing in an attempt to maintain the gene pool.[14] Eugenic considerations also lay behind the adoption of incest laws in much of the USA and were used to justify many anti-miscegenation laws.[15]

Some states sterilized "imbeciles" for much of the 20th century. The US Supreme Court ruled in the 1927 Buck v. Bell case that the state of Virginia could sterilize those they thought unfit. The most significant era of eugenic sterilization was between 1907 and 1963 when over 64,000 individuals were forcibly sterilized under eugenic legislation in the United States.[16] A favorable report on the results of sterilization in California, by far the state with the most sterilizations, was published in book form by the biologist Paul Popenoe and was widely cited by the Nazi government as evidence that wide-reaching sterilization programs were feasible and humane. When Nazi administrators went on trial for war crimes in Nuremberg after World War II they justified the mass-sterilizations (over 450,000 in less than a decade) by citing the United States as their inspiration.[17]

Almost all non-Catholic western nations adopted some eugenics legislation. In July 1933 Germany passed a law allowing for the involuntary sterilization of "hereditary and incurable drunkards, sexual criminals, lunatics, and those suffering from an incurable disease which would be passed on to their offspring..."[18] Sweden forcibly sterilized 62,000 "unfits" as part of a eugenics program over a forty-year period. Similar incidents occurred in Canada, United States, Australia, Norway, Finland, Denmark, Estonia, Switzerland and Iceland for people the government declared to be mentally deficient. Singapore practiced a limited form of "positive" eugenics that involved encouraging marriage between college graduates in the hope they would produce better children.[19]

Various authors, notably Stephen Jay Gould, have repeatedly asserted that restrictions on immigration passed in the United States during the 1920s (and overhauled in 1965) were motivated by the goals of eugenics, in particular a desire to exclude "inferior" races from the national gene pool. During the early twentieth century the United States and Canada began to receive far higher numbers of southern and eastern European immigrants. Influential eugenicists like Lothrop Stoddard and Harry Laughlin (who was appointed as an expert witness for the House Committee on Immigration and Naturalization in 1920) presented arguments that these were inferior races that would pollute the national gene pool if their numbers went unrestricted. It has been argued that this stirred both Canada and the United States into passing laws creating a hierarchy of nationalities, rating them from the most desirable Anglo-Saxon and Nordic peoples to the Chinese and Japanese immigrants who were almost completely banned from entering the country.[20] However several people, in particular Franz Samelson, Mark Snyderman and Richard Herrnstein, have argued that, based on their examination of the records of the Congressional debates over immigration policy, Congress gave virtually no consideration to these factors. According to these authors, the restrictions were motivated primarily by a desire to maintain the country's cultural integrity against a heavy influx of foreigners.[21] This interpretation is not, however, accepted by most historians of eugenics.

Some who disagree with the idea of eugenics in general contend that eugenics legislation still had benefits. Margaret Sanger (founder of Planned Parenthood of America) found it a useful tool to urge the legalization of contraception. In its time, eugenics was seen by many as scientific and progressive, the natural application of knowledge about breeding to the arena of human life. Before the death camps of World War II, the idea that eugenics could lead to genocide was not taken seriously.

After the experience of Nazi Germany many ideas about "racial hygiene" and "unfit" members of society were publicly renounced by politicians and members of the scientific community. The Nuremberg Trials against former Nazi leaders revealed to the world many of the regime's genocidal practices and resulted in formalized policies of medical ethics and the 1950 UNESCO statement on race. Many scientific societies released their own similar "race statements" over the years and the Universal Declaration of Human Rights, developed in response to abuses during the second World War, was adopted by the United Nations in 1948 and affirmed "Men and women of full age, without any limitation due to race, nationality or religion, have the right to marry and to found a family." [2] In continuation the 1978 UNESCO declaration on race and racial prejudice states that the fundamental equality of all human beings is the ideal toward which ethics and science should converge. [3]

In reaction to Nazi abuses, eugenics became almost universally reviled in many of the nations where it had once been popular (however some eugenics programs, including sterilization, continued quietly for decades). Many pre-war eugenicists engaged in what they later labeled "crypto-eugenics," purposefully taking their eugenic beliefs "underground" and becoming respected anthropologists, biologists and geneticists in the post-war world (including Robert Yerkes in the USA and Otmar von Verschuer in Germany). Californian eugenicist Paul Popenoe founded marriage counseling during the 1950s, a career change which grew from his eugenic interests in promoting "healthy marriages" between "fit" couples.[22]

High school and college textbooks from the 1920s through the 40s often had chapters touting the scientific progress to be had from applying eugenic principles to the population. Many early scientific journals devoted to heredity in general were run by eugenicists and featured eugenics articles alongside studies of heredity in non-human organisms. After eugenics fell out of scientific favor, most references to eugenics were removed from textbooks and subsequent editions of relevant journals. Even the names of some journals changed to reflect new attitudes. For example, "Eugenics Quarterly" became "Social Biology" in 1969 (the journal still existed in 2005 though it looked little like its predecessor). Notable members of the American Eugenics Society (1922-1994) during the second half of the 20th Century included Joseph Fletcher (originator of Situational ethics), Dr. Clarence Gamble of the Procter & Gamble fortune and Garrett Hardin, a population control advocate and author of The Tragedy of the Commons.

Despite the changed post-war attitude towards eugenics in the US and some European countries, a few nations, notably Canada and Sweden, maintained large-scale eugenics programs, including forced sterilization of mentally handicapped individuals, as well as other practices, until the 1970s. In the United States, sterilizations capped off in the 1960s, though the eugenics movement had largely lost most popular and political support by the end of the 1930s.[23]

Beginning in the 1980s the history and concept of eugenics were widely discussed as knowledge about genetics advanced significantly. Endeavors such as the Human Genome Project made the effective modification of the human species seem possible again (as did Darwin's initial theory of evolution in the 1860s, along with the rediscovery of Mendel's laws in the early 20th century). The difference at the beginning of the 21st century was the guarded attitude towards eugenics, which had become a watchword to be feared rather than embraced.

Only a few scientific researchers (such as the controversial psychologist Richard Lynn) have openly called for eugenic policies using modern technology but they represent a minority opinion in current scientific and cultural circles.[24] One attempted implementation of a form of eugenics was a "genius sperm bank" (1980-1999) created by Robert Klark Graham, from which nearly 230 children were conceived (the best known donor was Nobel Prize winner William Shockley). In the USA and Europe though, these attempts have frequently been criticized as in the same spirit of classist and racist forms of eugenics of the 1930s. Results, in any case, have been spotty at best.

Because of its association with compulsory sterilization and the racial ideals of the Nazi Party, the word eugenics is rarely used by the advocates of such programs.

Only a few governments in the world had anything resembling eugenic programs today. In 1994 China passed the "Maternal and Infant Health Care Law" which included mandatory pre-marital screenings for "genetic diseases of a serious nature" and "relevant mental disease." Those who were diagnosed with such diseases were required either to not marry, agree to "long term contraceptive measures" or to submit to sterilization. This law was repealed in 2004.

A similar screening policy (including pre-natal screening and abortion) intended to reduce the incidence of thalassemia exists on both sides of the island of Cyprus. Since the program's implementation in the 1970s, it has reduced the ratio of children born with the hereditary blood disease from 1 out of every 158 births to almost zero. Dor Yeshorim, a program which seeks to reduce the incidence of Tay-Sachs disease among certain Jewish communities, is another screening program which has drawn comparisons with eugenics. In Israel, at the expense of the state, the general public is advised to carry out genetic tests to diagnose the disease before the birth of a baby. If an unborn baby is diagnosed with Tay-Sachs the pregnancy may be terminated, subject to consent. Most other Ashkenazi Jewish communities also run screening programmes due to the higher incidence of the disease. In some Jewish communities, the ancient custom of matchmaking (shidduch) is still practised, and in order to attempt to prevent the tragedy of infant death which always results from being homozygous for Tay-Sachs, associations such as the strongly observant Dor Yeshorim (which was founded by a rabbi who lost four children to the condition in order to prevent others suffering the same tragedy) test young couples to check whether they carry a risk of passing on this disease or certain other fatal conditions. If both the young man and young woman are Tay-Sachs carriers, it is common for the match to be broken off. Judaism, like numerous other religions, discourages abortion unless there is a risk to the mother, in which case her needs take precedence. It should also be noted that, since all those with the condition will die in infancy, these programs aim to prevent these tragedies rather than directly eradicate the gene, which is a co-incidental by-product.

In modern bioethics literature, the history of eugenics presents many moral and ethical questions. Commentators have suggested the new "eugenics" will come from reproductive technologies that will allow parents to create so-called "designer babies" (what the biologist Lee M. Silver prominently called "reprogenetics"). It has been argued that this "non-coercive" form of biological "improvement" will be predominantly motivated by individual competitiveness and the desire to create "the best opportunities" for children, rather than an urge to improve the species as a whole, which characterized the early twentieth century forms of eugenics. Because of this non-coercive nature, lack of involvement by the state and a difference in goals, some commentators have questioned whether such activities are eugenics or something else all together.

Some disability activists argue that, although their impairments may cause them pain or discomfort, what really disables them as members of society is a socio-cultural system that does not recognise their right to genuinely equal treatment. They express skepticism that any form of eugenics could be to the benefit of the disabled considering their treatment by historical eugenic campaigns.

James D. Watson, the first director of the Human Genome Project, initiated the Ethical, Legal and Social Implications Program (ELSI) which has funded a number of studies into the implications of human genetic engineering (along with a prominent website on the history of eugenics), because:

Distinguished geneticists including Nobel Prize winners John Sulston ("I don't think one ought to bring a clearly disabled child into the world")[26] and Watson ("Once you have a way in which you can improve our children, no one can stop it.")[27] support genetic screening. Which ideas should be described as "eugenic" are still controversial in both public and scholarly spheres. Some observers such as Philip Kitcher have described the use of genetic screening by parents as making possible a form of "voluntary" eugenics.[28]

Some modern subcultures advocate different forms of eugenics assisted by human cloning and human genetic engineering, sometimes even as part of a new cult (see Ralism, Cosmotheism, or Prometheism). These groups also talk of "neo-eugenics", "conscious evolution", or "genetic freedom" .

Behavioral traits often identified as potential targets for modification through human genetic engineering include intelligence, depression, schizophrenia, alcoholism, sexual behavior (and orientation) and criminality.

Most recently in the United Kingdom a court case, the Crown v. James Edward Whittaker-Williams, arguably set a precedent of banning sexual contact between people with learning disabilities. The accused, a man suffering learning disabilities was jailed for kissing and hugging a woman with learning disabilities. This was done under the 2003 Sexual Offences Act which redefines kissing and cuddling as sexual and states that those with learning difficulties are unable to give consent regardless of whether or not the act involved coercion. Opponents of the act have attacked it as bringing in eugenics through the backdoor under the guise of a requirement of "consent".

While the science of genetics has increasingly provided means by which certain characteristics and conditions can be identified and understood, given the complexity of human genetics and culture, there is at this point no agreed objective means of determining which traits might be ultimately desirable or undesirable. Would eugenic manipulations that reduce the propensity for risk-taking and violence, for example, in a population lead to their extinction? On the other hand, there is universal agreement that many genetic diseases, such as Tay Sachs, spina bifida, Hemochromatosis, Down syndrome, Rh disease, etc. are quite harmful to the affected individuals and their families and therefore to the societies to which they belong. Eugenic measures against many of the latter diseases are already being undertaken in societies around the world, while measures against traits that affect more subtle, poorly understood traits, such as risk-taking, are relegated to the realm of speculation and science fiction. The effects of diseases are essentially wholly negative, and societies everywhere seek to reduce their impact by various means, some of which are eugenic in all but name. The other traits that are discussed have positive as well as negative effects, and are not generally targeted at present anywhere.

A commonly advanced criticism of eugenics is that, evidenced by its history, it inevitably leads to measures that are unethical (Lynn 2001). H. L. Kaye wrote of "the obvious truth that eugenics has been discredited by Hitler's crimes" (Kaye 1989). R. L. Hayman argued "the eugenics movement is an anachronism, its political implications exposed by the Holocaust" (Hayman 1990).

Steven Pinker has stated that it is "a conventional wisdom among left-leaning academics that genes imply genocide." He has responded to this "conventional wisdom" by comparing the history of Marxism, which had the opposite position on genes to that of Nazism:

Richard Lynn argues that any social philosophy is capable of ethical misuse. Though Christian principles have aided in the abolition of slavery and the establishment of welfare programs, he notes that the Christian church has also burned many dissidents at the stake and waged wars against nonbelievers in which Christian crusaders slaughtered large numbers of women and children. Lynn argues the appropriate response is to condemn these killings, but believing that Christianity "inevitably leads to the extermination of those who do not accept its doctrines" is unwarranted (Lynn 2001).

Eugenic policies could also lead to loss of genetic diversity, in which case a culturally accepted improvement of the gene pool may, but would not necessarily, result in biological disaster due to increased vulnerability to disease, reduced ability to adapt to environmental change and other factors both known and unknown. This kind of argument from the precautionary principle is itself widely criticized. A long-term eugenics plan is likely to lead to a scenario similar to this because the elimination of traits deemed undesireable would reduce genetic diversity by definition.

The possible elimination of the autism genotype is a significant political issue in the autism rights movement which claims autism is a form of neurodiversity.

One website on logic has used the statement "Eugenics must be wrong because it was associated with the Nazis" as a typical example of the association fallacy. [5] The stigmatization of eugenics because of its association, on the other hand, has not at all slowed the application of medical technologies that decrease the incidence of birth defects, or to slow the search for their causes.

In some instances, efforts to eradicate certain single-gene mutations would be nearly impossible. In the event the condition in question was a heterozygous recessive trait, the problem is that by eliminating the visible unwanted trait, there are still as many genes for the condition left in the gene pool as were eliminated according to the Hardy-Weinberg principle which states that a populations genetics are defined as pp+2pq+qq at equilibrium. With genetic testing, it may be possible to detect all of the heterozygous recessive traits, but only at great cost.

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