For someone who so frequently and serenely proclaims that hes right, Steven Pinker can get curiously defensive. In Rationality: What It Is, Why It Seems Scarce, Why It Matters, Pinker writes as if hes part of an embattled minority, valiantly making the case that the ability to use knowledge to attain goals is so underappreciated these days that the reading public needs a new book (by Pinker) to lay out rational arguments for rationality itself.
Pinker doesnt believe he has much hope of reaching the anti-vaxxers and conspiracy theorists who indulge in the florid fantasies of QAnon. We may be living through a pandemic of poppycock, he says, but he refuses to submit to the cynical view that the human brain is a basket of delusions.
After all, people use rationality all the time in their everyday lives, consulting the knowledge they have in order to get what they want. To illustrate this principle, Pinker gives the example of the San hunter-gatherers of the Kalahari Desert, who will assume that a set of ambiguous animal tracks come from a common species unless they get definitive evidence that the tracks must belong to a rarer one. This, he says, is the essence of Bayesian reasoning assessing evidence in terms of prior knowledge.
Still, Pinker is troubled by what he sees as rationalitys image problem. Rationality is uncool, he laments. It isnt seen as dope, phat, chill, fly, sick or da bomb. As evidence for its diminished status, he quotes celebrations of nonsense by the Talking Heads and Zorba the Greek. (Pinker is also vexed by the line Lets go crazy, which he says was adjured by the Artist Formerly Known as Prince.) Its precisely this cultural derision of reason, he says, that prevents us from appreciating rationalitys spectacular accomplishments. Human progress is an empirical fact, he writes. Progress is shorthand for a set of pushbacks and victories wrung out of an unforgiving universe, and is a phenomenon that needs to be explained. The explanation is rationality.
The argument will sound familiar to readers of Pinkers 2018 book, Enlightenment Now, with its insistence that everything is amazing and its repeated complaints about people complaining too much. (The example of the San hunter-gatherers appeared in Enlightenment Now, too.) This new book grew out of a class Pinker taught at Harvard. Like many psychologists, he writes, I love to teach the arresting, Nobel Prize-winning discoveries of the infirmities that afflict human reason along with the intellectual tools of sound reasoning. Most of Rationality is given over to ideas from game theory and behavioral economics parsing the discrepancy between model and reality. If a perfectly rational actor is expected to behave one way, why do so many people behave the way they do?
So Pinker spends page after page walking us through concepts like base-rate neglect (giving too little weight to the original probability of an event in the face of new information) and the availability heuristic (guessing the likelihood of an event according to what comes easily to mind). Despite Pinkers bombastic declaration in his preface that he knew of no book that tried to explain them all, a great deal of Rationality repackages (with due credit) the pioneering work of scholars like Thomas Schelling, Daniel Kahneman and Amos Tversky. When Pinker is dealing with abstract puzzles involving small-stakes situations, the book is familiar but fine.
The trouble arrives when he tries to gussy up his psychologists hat with his more elaborate public intellectuals attire. The person who succumbs to the small pleasure of a lasagna dinner instead of holding out for the large pleasure of a slim body is apparently engaged in a similar kind of myopic thinking as the half of Americans nearing retirement age who have saved nothing for retirement. His breezy example elides the fact that according to the same data the median income for those non-saving households is $26,000, which isnt enough money to pay for living expenses, let alone save for retirement.
Some of Pinkers observations on racial issues are similarly blinkered. Are mortgage lenders who turn down minority applicants really being racist, he muses, or are those lenders simply calculating default rates from different neighborhoods that just happen to correlate with race? (A long history of racist redlining may happen to have something to do with this too, but Pinker doesnt get into it.) He goes on to ask why race, sex, ethnicity, religion and sexual orientation have become war zones in intellectual life, even as overt bigotry of all kinds has dwindled.
Anyone paying attention to whats been happening in the last few years might wonder where he got his information. In support of his vague claim, Pinker directs the reader to a footnote citing two sources: a study, whose data ended in 2016, that measured a persons explicit attitudes based on self-reporting (i.e. the respondents had to admit their bigotry); and a few (unhelpful) pages from Enlightenment Now.
The tone of Rationality isnt as relentlessly chipper as that of the previous book, but Pinkers optimism seems to have weathered the Trump years and the pandemic largely intact. He still disparages those who have the audacity to question his ideas about progress who argue that enlightened elites invoking the language of reasonableness havent always benefited humanity. He repeatedly says that by promoting rationality hes promoting epistemic humility, but youd be hard-pressed to find much humility here, as he pronounces that among the biggest barriers to rationalitys triumph is the universities left-wing suffocating monoculture.
As it happens, it was at Harvard University that Pinker taught a course on taboo with the lawyer and fellow professor Alan Dershowitz. A couple of years ago, Pinker came under fire when some photos surfaced of him with Dershowitzs onetime client Jeffrey Epstein. Pinker eventually explained that he and Epstein barely knew each other that he had never taken any funding from Epstein and couldnt really stand the guy. There is no reason whatsoever to doubt Pinkers account; to suggest that their mere acquaintance in any way undermines Pinkers work would be to make the kind of ad hominem fallacy that he rightfully pillories in this book.
But there was something else something that bears more directly on his thesis that rationality has been such a benevolent force for progress. In 2007 Pinker lent his professional expertise to Epsteins legal defense team, which argued that Epstein hadnt violated a federal statute prohibiting the use of the internet to lure minors across state lines for sexual abuse. According to Dr. Pinker, that is the sole rational reading in the English language, the affidavit stated a sterling example of a thinking process so confidently pristine that it can give unthinking cover to the grotesque.
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