I think too, there are a lot of people who haven't worked on their anger issues or identified their anger yet in some areas so don't "get" angry. I don't think that is bad or abnormal or anything, just how it is with them at this time. I don't think everyone identifies "anger" the same way.

I think it is a lot like abuse and how long that can take for some people to understand that they have been abused. It just seems "normal" because that's all they've known. If there wasn't any "anger" in the household, if it wasn't "allowed", spoken of or looked at/seen for what it was, it can be hard to identify.