I think if somebody is so set in their ways about what they feel about something - and you get this a lot in academia, of course, and also different sorts of journalism too - you're going to sweep under the carpet the facts that don't suit your thesis. And I think that happens quite a lot in the courtroom, for instance.
I have thought sometimes that the sanest people, the people who are just very balanced, very happy, are probably lower achieving than other people. My kind of irrationality happens to be fear or anxiety.