I think some people naturally are at a much higher risk than other to be violent, and often their upbringing will bring this out even more. Even people who probably wouldn't be violent can be effected greatly by their upbringing. Someone raised in a ghetto where community leaders might be drug dealers will probably grow up hating police who take their (negative) role models away, and most of the kids raised in a high income town of 99.9% white people will probably have at least some fear of minorities (I see it every day).
Still, I think with good parenting and proper discipline (non violent discipline should be used mostly), anyone will turn out at least fairly non-evil.
The only exception would be someone with a mental defect making them unable to understand pain and/or emotions.
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