I'm not a psychologist obviously, but just based on general knowledge gathered over time, I doubt there is a genetic pre-disposition. I would wager that most of it is environmental. I read somewhere before that most pedophiles themselves were abused as children. When stuff happens to you at the age your brain is "wiring" itself, the impulses can be planted beyond your control.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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