The moral: in politics, critical thinking is an act of charity. Objective truth has to beg for spare change to survive. Owing to these perverse incentives, almost any political idea that becomes popular tends to remain popular.49 Even if it’s false. Even if it’s always been false. Why would the false become popular in the first place? Because human beings don’t like expressing—or believing—ugly truths. Instead, we gravitate—in word and thought—to views that “sound good.” Psychologists call this Social Desirability Bias.50 “There’s no such thing as a stupid child” sounds better than “10% of
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