BS. You're saying that Hitler had a particular reason for killing Jews. Jews were rich and Hitler didn't like that so he started a genocide. That's a justification and a poor one at that.
Hitler was evil. No matter what reasons he had for what he did, that is the truth.
Good and evil are pretty feeble concepts. I'm sure the Aztecs didn't think of human sacrifice as evil, just as the Romans didn't think of gladiatorial combat as evil. Are human beings
smarter now than they were then? Do we think more rationally? Is poverty not as extreme an evil as bodily harm? Maybe future generations will regard not giving handouts to the beggar on the street as an extreme evil. I know it's a philosophical question that's still debated on, but I wouldn't agree that there is an absolute, ingrained definition of good and evil in the world.
And saying "that is the truth" sounds to me like an absolute. Best avoid dealing in absolutes.
I don't see the OP as a justification, but rather a reminder that there are no two-dimensional villains in real life - nobody who acts without cause (even if it's an unjust one), and without thinking that they're doing right. Hitler was responsible for terrible things, and he certainly deserves no sympathy. But he was also a human being, and there's a chain of events in his life that led him to behave in a way that we can rightly perceive as illogical.
When looking for villains, I'd say serial killers are far easier to point out - because their actions aren't driven by anything resembling logic. But then you have that statistic, that 99% of serial killers were abused as children. That doesn't even come close to excusing them, of course. We can't sympathize with them and it's hard to pity them. They make it pretty bloody difficult to understand them. But we
can, at the end of the day, look back on their pathetic, miserable lives and wonder how differently they might have turned out had the circumstances around them been otherwise.
All I'm saying is that there are factors at play in every human life. Condemn if necessary, but don't judge - judging is too easy when you don't understand a person's motivations: empathy requires understanding. Am I making any sense here, or what?