I don't think that's quite right. From what you said, if I understand, the enforcement, and recency are the determining factors? Nothing of justice or fairness? I suppose any atrocity or action is fine as long as the people who were alive at the time (we'll ignore their descendants whose lives are obviously affected) are dead and gone for a few decades.

Why is 80 years enough? Where did you even get that number? I figure you started off with "this is ok", then looked at how much time passed, then declared it was "enough".