From this perspective, violence is a glitch in the system, something gone wrong. Adrian Raine has likened violent crime to a kind of cancer, as both are products of a combination of genes and environment, and both can be seen as diseases that deserve treatment. But there is another, opposite, view, popular among economists and evolutionary theorists. This is that violence is an essential part of life, an often rational solution to certain problems. Cancer is an aberration, an illness, something that could be cleanly excised from the world: If it were eradicated tomorrow, the rest of human life
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