That's a part of it. But there is more. Sometimes you fail to see how your behaviour is wrong because, hey, you're pure. If there's something wrong in the world

That's a part of it. But there is more. Sometimes you fail to see how your behaviour is wrong because, hey, you're pure. If there's something wrong in the world, it is others' fault. There are two main obvious variants of this. One is blindness to some aspect of your behaviour that causes harm to others but it is not in your creed, like you're courteous and think of the common good, but you're a jerk or a violent person. Time ago someone said here in a comment that he almost punched a man in his face for throwing a cigarette butt on the street. The other is when your ideas are just wrong or the means to achieve them. Some persons think that sex and drugs are evil. Others think that repression is worse. In general, every idea of purity tends to create the image of an impossible world that just generates frustration. I suspect every idea that seems to expand into minutiae obsesively.