Every person's different, but what you need to know is that when you are in a "Mania", your reality changes. Fights errupt and it's only later that you can see that as justifiable as your stance was because of your interpretation of the situation, that it's the interpretation that might be quite 'off'. It's very scary to not be able to trust yourself and to not be able to know that how you are seeing things is 'real'. Most of us BP people (so it seems) tend to over analyze the piss out of everything and if it's not turned on someone else, then it's turn on to ourselves. I have Bipolar Type I and when I'm in a mania I don't see what I am doing is wrong. When I'm depressed, if I even begin to consider how wrong I really was, I'm so completely devastated that I am in agony and all I think about is how to kill myself. So it's now, since I have a new scenario in the midst - I'm now medicated. I've actually attended some AA meetings and read some of their jargon, because a lot of the same shame that people who suffer from additions endure, is also what I have had to go through: "Oh what have I done".
They may seem like they don't care, but that's not necessarily any indication of how they are actually feeling and how they morally feel about any of it. We don't get the luxury of Good 'Ol Fashion self-loathing where we feel like ***** for a while and then come out of it... sometimes regret like that is enough to open up a portal to a hell of our own making.

Hope that gives some insight. Feel free to write if you had any questions about any of that.