I believe in a mix between nature and nurture. You can be born with a predisposition to evil, but if you are raised in a good environment, you may never succumb to it. Conversely, you may be born good, but your environment could abuse and corrupt you to such an extent that you become evil in response to it.
Then again, you could be born evil into an abusive environment. That's when you get serial killers and sociopaths and dog killers and the like.
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