It is immoral from almost any point of view to refuse to defend yourself and others from very grave and terrible threats, even as there are limits to the means that can be used in such defense.
I don't think there's anything more important than making peace before it's too late. And it almost always falls to the child to try to move toward the parent.
I think it was Freud who said that we're all arrested at a certain age. For me, it was always 13.