Sure, but is that a good argument? We used to make mistakes because we did not know better (for a long time anyway) so now, even though we do know better, we c

Sure, but is that a good argument? We used to make mistakes because we did not know better (for a long time anyway) so now, even though we do know better, we can let everyone make the same mistakes? Out of some weird sense of avoiding time-travelling hypocrisy? How far does that go?