Drew DeSilver in The Seattle Times:
Back in 1982, Air Florida Flight 90 was attempting to take off from Washington, D.C., in a blinding snowstorm. Though the co-pilot was concerned the plane's wings hadn't been thoroughly de-iced and his instrument panel wasn't displaying the correct airspeed, the pilot dismissed his concerns until seconds before the plane crashed into the Potomac River, killing all but five aboard.
The crash, as cockpit voice recordings later showed, was primarily the result of the pilot's overconfidence leading him to ignore or minimize a whole series of warning signs that his more observant, but less assertive, colleague had pointed out to him. It's one of the most dramatic illustrations of the costs of self-deception in Robert Trivers' new book, “The Folly of Fools: The Logic of Deceit and Self-Deception in Human Life” (Basic Books, 397 pp., $28).
Trivers, an evolutionary biologist who teaches at Rutgers, starts by asking one of those questions that seems obvious once someone else asks it: Why should our brains — whose job, after all, is to make sense of everything we see, hear, touch, taste and smell — be so prone to self-deception? Natural selection would seem to work against creatures who persistently fail to see the world as it is, yet self-deception seems to be deeply embedded in our psyches.
Trivers' answer, which he first advanced in 1976 and has been elaborating since, is that we deceive ourselves the better to deceive others. If we can convince ourselves that we are stronger, smarter, more skillful, more ethical or better drivers than others, we're a long way toward convincing other people too.