These people are so shallow and lack any introspection.

It's a story, and everyone fills their roles. The Wicked Witch is, well, wicked. It doesn't matter what lead her there, that's the role she plays, and has embraced.

Plenty of victimizers were also victims. You can feel bad for them, but it doesn't change their current role. Plenty of serial killers, rapists, and the like were abused as kids. Really fucked up stuff, and you should pity their past, sure. If the role you play though, is the Serial Killer, or the Rapist, you're a despicable person. Yeah, you had a rough childhood, and that definitely is sad...but you're out there killing and raping people, man! That is kind of the more important bit.

If you're the Wicked Witch, you're wicked. You don't get to be the good guy. You haven't tried to redeem yourself, you haven't reformed your ways...you're the Wicked Witch. If you haven't stopped the wickedness...I think it's fair for people to judge you as the Wicked Witch. You know, if you're out there being all wicked and stuff.

It really is so surface level. These people claim to be all smart and empathetic, but the actions and behavior of a character is what matters, not the backstory. You don't get to be the Good Guy, while being the Bad Guy, just because you have a backstory. A backstory adds depth, but doesn't change the role someone plays...again, up until the point they might actually decide to change and lay aside their past role.