I think there's an underlying problem - a giant flaw in the human mind - that affects much more than just religion. The huge flaw is the mistaken belief that the thought "This idea makes sense to me" is correlated with the idea being true.
This huge flaw is the underlying cause of religious zealotry, bigotry, and pretty much all self-righteous behavior. We often see this huge flaw manifest itself in what you refer to as "Conservative Brain Defect," but the flaw exists in liberal minds as well, though perhaps not as jarringly.
I used the word bigotry to describe that flaw. I see bigotry as the conviction that there is a good and an evil coupled with the assumption that what one believes good and evil to be is actually what good and evil really are. The ego attaches to the notion that one is good because the good is good. A bigot then becomes a fanatic because if you tell him what he believes to be good isn't good, you attack his self respect because he thinks you are saying there is no such thing as good, that he isn't good. A bigot has a personal stake in believing what he believes is good. You are telling him he is what he actually hates, and he will reject that because he believes that good is real.
The whole problem is ego attachment to good and evil because neither of them exist. There is only love and perfection; there is only the timeless now. The duality, the delusion we suffer, is caused by language and thinking. With words we create ideas and concepts and use them to cause pain. We put our kids down and make them feel evil if they don't behave. We have a fractured divided consciousness and have lost our connection to God within.