Yes, the principle should apply to all abusers in my opinion. But I get that it's not going to be cut and dry how to deal with every situation.
And I agree, it would have been good if we would have had a moderator who could have stopped all this before it carried on as long as it did. Unfortunately that wasn't the case, but we are all adults here and really, it's not that hard to figure this out for ourselves I don't think.