THE RIGHTEOUS MIND
Why Good People Are Divided by Politics and Religion
By Jonathan Haidt
Illustrated. 419 pp. Pantheon Books. $28.95.
Haidt seems to delight in mischief. Drawing on ethnography, evolutionary theory and experimental psychology, he sets out to trash the modern faith in reason. In Haidt's retelling, all the fools, foils and villains of intellectual history are recast as heroes. David Hume, the Scottish philosopher who notoriously said reason was fit only to be "the slave of the passions," was largely correct. E. O. Wilson, the ecologist who was branded a fascist for stressing the biological origins of human behavior, has been vindicated by the study of moral emotions. Even Glaucon, the cynic in Plato's "Republic" who told Socrates that people would behave ethically only if they thought they were being watched, was "the guy who got it right."
To the question many people ask about politics - Why doesn't the other side listen to reason? - Haidt replies: We were never designed to listen to reason. When you ask people moral questions, time their responses and scan their brains, their answers and brain activation patterns indicate that they reach conclusions quickly and produce reasons later only to justify what they've decided. The funniest and most painful illustrations are Haidt's transcripts of interviews about bizarre scenarios. Is it wrong to have sex with a dead chicken? How about with your sister? Is it O.K. to defecate in a urinal? If your dog dies, why not eat it? Under interrogation, most subjects in psychology experiments agree these things are wrong. But none can explain why.
The problem isn't that people don't reason. They do reason. But their arguments aim to support their conclusions, not yours. Reason doesn't work like a judge or teacher, impartially weighing evidence or guiding us to wisdom. It works more like a lawyer or press secretary, justifying our acts and judgments to others. Haidt shows, for example, how subjects relentlessly marshal arguments for the incest taboo, no matter how thoroughly an interrogator demolishes these arguments.
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