Woe is us. Our own actions don't conform to our beliefs. Woe on us. First, we get to feel right. Feeling right is a strong drug.
Some people sacrifice a lot to be right.
As I mentioned, the irony is that when we punish another, we first punish ourselves. Second, anger is a habit. The habit is so ingrained in some people that they haven't understood a word of this chapter. When people do something wrong, I will naturally feel upset. When I do something bad, I will of course feel guilty.