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147 " At the simplest level, memory smooths out the wrinkles of dissonance by enabling the confirmation bias to hum along, selectively causing us to forget discrepant, disconfirming information about beliefs we hold dear. If we were perfectly rational beings, we would try to remember smart, sensible ideas and not bother taxing our minds by remembering foolish ones. But dissonance theory predicts that we will conveniently forget good arguments made by an opponent, just as we forget foolish arguments made by our own side. A silly argument in favor of our own position arouses dissonance because it raises doubts about the wisdom of that position or the intelligence of the people who agree with it. Likewise, a sensible argument by an opponent arouses dissonance because it raises the possibility that the other side, God forbid, may be right or have a point we should take seriously. Because a silly argument on our side and a good argument on the other guy’s side both arouse dissonance, the theory predicts that we will either not learn these arguments well or forget them quickly. And that is just what Edward Jones and Rika Kohler showed in a classic 1958 experiment on attitudes toward desegregation in North Carolina.3 Each side tended to remember the plausible arguments agreeing with their own position and the implausible arguments agreeing with the opposing position; each side forgot the implausible arguments for their view and the plausible arguments for the opposition. "

Carol Tavris , Mistakes Were Made (But Not by Me): Why We Justify Foolish Beliefs, Bad Decisions, and Hurtful Acts