motivated unreasoning

Psychologists have a term for this: “motivated reasoning,” which Dan Kahan, a professor of law and psychology at Yale, defines as “when a person is conforming their assessments of information to some interest or goal that is independent of accuracy”—an interest or goal such as remaining a well-regarded member of his political party, or winning the next election, or even just winning an argument. Geoffrey Cohen, a professor of psychology at Stanford, has shown how motivated reasoning can drive even the opinions of engaged partisans. In 2003, when he was an assistant professor at Yale, Cohen asked a group of undergraduates, who had previously described their political views as either very liberal or very conservative, to participate in a test to study, they were told, their “memory of everyday current events.”

The students were shown two articles: one was a generic news story; the other described a proposed welfare policy. The first article was a decoy; it was the students’ reactions to the second that interested Cohen. He was actually testing whether party identifications influence voters when they evaluate new policies. To find out, he produced multiple versions of the welfare article. Some students read about a program that was extremely generous—more generous, in fact, than any welfare policy that has ever existed in the United States—while others were presented with a very stingy proposal. But there was a twist: some versions of the article about the generous proposal portrayed it as being endorsed by Republican Party leaders; and some versions of the article about the meagre program described it as having Democratic support. The results showed that, “for both liberal and conservative participants, the effect of reference group information overrode that of policy content. If their party endorsed it, liberals supported even a harsh welfare program, and conservatives supported even a lavish one.”