They won't. People have been violent since the dawn of time. A "person" can learn that violence begets more violence but people (en mass) will never learn that. Welcome to the human race.
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I mean if you're going to think of hypothetical situations about everyone dying and your limbs evaporating and a rabid dog chewing your face off as you lay there on the pavement, okay, fine. :P How exactly would a person argue against that?
But in more realistic cases, I'm against suicide, and I don't sympathize, I'm just outraged.