Where else would it come from? Nature and nurture are the only options; culture can certainly encourage (or suppress) violence, but it&#x27;s pretty obvious that it isn&#x27;t the <i>sole</i> cause of violence.<p>Maybe I should clarify. I&#x27;m not saying that every human being secretly yearns to smash and kill. I&#x27;m saying that most of the human race has an instinctive drive to respond to certain setbacks with violence, and some people (whether through nature, nurture, or both) find it more difficult to suppress that than others.