The tendency for conservatives to think largely in terms of black and white for every single issue on the planet. Mostly a result of an absolutist religious upbringing, I believe.
Bob, a 43 year old loving father of two, with a spotless criminal record, assaults a sixteen year old girl. Everyone is shocked and puzzled. When caught, he has a nervous breakdown and is put in a mental institution. There, he undergoes various tests and scans. Doctors discover a giant tumor in the part of the brain responsible for sexual activities.
They remove it via surgery, and he's back to normal again. There's no doubt about it - from similar cases we can see that tumors in that part of the brain drive normal men crazy. What to do?
Liberal: After having considered all the evidence, I don't see any point in incarcerating him. He's not a threat. I fucking hate worthless child molesters but he clearly can't be held responsible for this. Probation should do, just in case I'm wrong. (though i doubt it)
Moderate: The science involved certainly seems to indicate that he's not responsible for this disgusting deed. Given his prior record, he doesn't seem like a threat. Still, I'm not totally convinced. A year in prison maybe? More testing, in any case.
Conservative: Why the fuck are we even talking about this? Tumors don't do anything anyway, that's just a THEORY! Has everyone lost their fucking mind, he attacked a helpless child! Stone him to death! Oh wait, I forgot that we don't live in Afghanistan or Iran. Well in that case, give 'im the lethal injection. Shit, that's not allowed for non-murderers? SHIT! I swear, liberals are bleeding this fucking country dry! DEATH TO LIBERALS!!! *waves rebel flag*
Conservative Black and White Thinking Disorder is a major problem in the US, sadly. Mostly as a result of religious faith.
For another example, see black and white thinkers