I would apologize if I did anything that would hurt someone. I also tend to preemptively apologize/warn if I notice I'm in an irritable depression/hypomania. "I'm really irritated at the world, if I insult you I'm really sorry and don't mean it, I'm doing my best! Just call me out on it later" is something I'll say if I notice myself getting pissed off with someone I'm close to.

I don't really have anger issues, and no violence. I also don't have mania or psychosis, so that likely helps me out. I would never, ever, be able to plead an insanity case. I wouldn't qualify, because I'm always aware of what I am doing, even if I can't always get my mouth to shut up.

While I may not feel sorry for having an episode, like. I'm not going to go "Hey, I'm sorry I've been depressed for such a long time" I will genuinely feel sorry if I've been neglecting someone, and I'll apologize for that because my actions and choices are affecting them - and even though it's an illness, I'm still responsible for the effect that I have on others. If I didn't care about how I might hurt them, even when I'm at my worst, then I don't think I could consider myself a good friend because not feeling sorry for what I did to them afterwards would show me that I didn't really care about them... and that wouldn't be fair to them at all.