Umm... To be clear I'm an atheist. I don't agree with most Christians but I respect their faith just like I would hope they respect my lack of faith. For the most part I agree with you. Many people on this board tend to conveniently ignore negative events from the past.

My point was that people tend to lose sanity when discussing subjects they are most passionate about. Confirmation bias is most likely to creep in to their thought processes the closer and more passionate they are about the subject.

The problem with leftists today is that they have been taught that emotion is all important. Thus when they discuss politics they become even more passionate and lose all logic/sanity. Its is a fatal flaw in the very foundational structure of how they function.

Its also the root of what the OP is talking about. The only way they can shore up their emotional stability is to push aside anything that disrupts it. Ignorance is bliss...