As someone said, liberalism is a mental illness.
Staunch conservatives are the ones with a problem.
Although, I'd call it a personality disorder not a mental illness.
They are the ones that are incapable of admitting that they're wrong, or changing an opinion.
Even in the face of overwhelming evidence. They "stand firm" in their beliefs, and never "waffle".
And of course, God backs their platform 100%.
I actually think that being able to "never be wrong" is what attracts people to conservatism, more so than the actual beliefs.