If you dont mind I'll just pick out a few quotes from your post and respond to them in turn as best I can(?)
asp3 wrote:
"I think one of the reasons I object to calling people evil, even though I consider what they've done reprehensible, is because I think it gives support to the idea that there are good people and evil people. I find that some people who believe that also believe that there will always be evil people. With that opinion there isn't any reason to see if we can prevent people from doing evil things because some people are just evil."
Hmmm, I think it fair to assume there are good and evil people, in the sense not everyone in our populations could turn into a serial killer whatever you did to them in their early lives or beyond, and equally there are serial killers who could have been treated completely differently all their lives, (lets say using the example of identical twins?), and would still have gone on to do what they eventually did.
This is very far from saying the way you bring a child up has no bearing whatsoever on the way they turn out on the "evil or good scale", because that is completely ridiculous to say or think such a thing, and with my father's rights hat on for a second, I would be claiming their dads involvement in the child's life made no difference to them, (ditto their mother).
asp3 wrote:
"I am not one of the people who would give Hitler any credit for anything he might have done that can be seen as good. However on the other hand Hitler was a baby and then a young boy at one time. I'm not sure if we know enough about that period of his life to know whether or not he was doing evil things as a boy.
We do know that at least some killers are cruel to animals as children."
Hitler, as I understand it was prepared to be kind to animals whilst doing what he did to so many humans, but one exception does not disprove your suggested rule, although my feelings would be do not put too much reliance upon it. What accolades might one fairly give Hitler, I'd accept Churchill's view when he acknowledged his role in resisting communism, and stop there, though my father recognised he must have had a very quick brain, and considerable understanding about how to build cohesive organisation, you couldn't really argue against those things, be they evil or good.
asp wrote:
"The argument I was trying to make is that what's evil for some is standard practice for others."
I may be misinterpreting your comments but this sounds a little like excusing wrong doing that might be fairly described as evil, (apologies if I am misinterpreting you?).
My last comment is to ask you a question you really dont need to answer, but I will answer it for myself. Have you ever been told you are evil, (I have

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)?