I find this comment particularly interesting. I have a suspicion that believing in good and bad people is a product of fairytales and religion. I've never quite understood why authoritarianism, religion and the right seem to go together, maybe this is part of puzzle.
I don't think religion etc. is to blame personally, it's a simple extension of believing that I am good, and I am like her, and she is good, and we are not like them. We never see ourselves as the people who could tip over the edge.