This political scientist named Brendan Nyhan at Dartmouth has documented what happens when you show people evidence that their beliefs are wrong.
Instead of thinking, hmmmm, maybe I need to reassess here, what most of us do is go back and think about why we’d come to those beliefs in the first place. And in the process of doing that, we remember how great those reasons were and we end up reinforcing our original beliefs. Instead of re-evaluating, you become more sure of yourself.

Notes