I just came across this quote by Stephan Lewandowsky, University of Western Australia.

It sure fits with the birther business.

Ideology trumps facts.

And it doesn’t matter what the ideology is, whether socialism, any brand of fundamentalist religion, or free-market extremism. The psychological literature shows quite consistently that a threat to one’s worldview is more than likely met by a dismissal of facts, however strong the evidence. Indeed, the stronger the evidence, the greater the threat — and hence the greater the denial.