Reason is the slave of the passions

Super-smart people, as Haidt notes in The Righteous Mind, are more skilled than others at finding arguments to justify their own points of view. But when they are asked to find arguments on the opposite side of a question, they do no better than anyone else. Brainpower makes people better press secretaries, but not necessarily better at open-minded, self-critical thinking.

Jonathan Rauch, The Constitution of Knowledge