Technically, what you’re proposing regarding her is more like Luke deciding to kill Vader despite knowing he’s his father and heeding Obi-Wan’s statement of killing him, and THEN turning to the dark side anyways. Remember, speaking out against your father =/= being a good guy. In fact, Citizen Louis voted against his own brother for the death penalty, and I don’t think many people would call HIM good.
Unfortunately there are lots of people today who would do exactly the same as Heinrich Himmler, but we can’t just round them all up and hang them, can we? I know some of them personally. They’re deluded and pissed off about something that’s a total lie. They can’t be reasoned with. I can only pray that God will some day save them from their own foolishness.