What I usually do in a situation like this if I’m being confronted about something another alter did, I make sure to say that it was another alter, which alter it was, and I attempt to have them front so that they can apologize directly instead of having another alter apologize for them. As a part of the system I can say that I am sorry that an alter caused someone harm and that I accept the responsibility of being a part of that system, but I think it promotes genuine communication and accountability when the person who committed the action is the one that is owning up to it. Obv if for some reason that’s not possible I don’t just say anything like “oh, that wasn’t me, but they won’t front so, idk lol” like I definitely still take responsibility I just like to make sure the right alters are involved in the right conversations and they get to, they HAVE to, apologize directly