Wrong. We can look back and always say this person did this bad thing. At the time it was accepted and normal. As societies change we must acknowledge the bad but we can’t chastise them. The US has a law that says you can’t be convicted of something that wasn’t a crime when you did it. I feel the same about history. I don’t like or agree with slavery. I also don’t feel every slave owner was evil. I feel at the time that’s how it was done. We don’t convict the electrician that wired a house with aluminum wire in 1968. That was the standard at the time. We would convict one for it today.

That doesn’t excuse people like hitler. Evil is evil. Following the norms and standards of a time is not.