Punchline: We're most violent when we're 2 years old, but we're not able to inflict much harm. At 3, when we get coordinated, our violence proclivities decrease. So it's not about testosterone, or adolescence, it's about human nature. I disagree with Parker however, on the conclusions he draws. I find his nature/nurture dichotomy simplistic. Violent impulses != violent actions.

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