Small prefrontal lobes, large adrenal glands. This is what the species is...impulsive, neurotic, aggressive, and our capacity for reason isn't what we claim it is.
The fact that we think that there is something wrong with surrendering ourselves to our base instincts is wonderful in my view, we want to be better(or "better")...marvelous. With that said, that doesn't excuse people forming an ideal and then becoming indignant when it doesn't line up with reality, there's really no reason that it should. You have to ignore all of the physical and observable evidence in the world to maintain your own self-righteous fiction.
It's a huge and really very obvious logical fallacy...but it's seldom addressed and seldom understood.