Yeah, it is my personal belief, really, so I'm not sure where the author stands on it.

I think BotI handles this ambiguity with revenge. Revenge for the sake of family is something sanctioned in that society, I get the impression. And thusly, if Rin doesn't take her revenge, there will never be any justice for her parents. And so that makes things very different, IMO, because if society says it's okay for Rin to be a vigilante, than that gets rid of many of the traditional arguments against vengeance.

Sasuke: Yes, I agree, that Itachi has made it impossible to get rid of his duty to slay him.