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Killing is fundamentally in our nature because over the eons of human evolution murder was so surprisingly beneficial in the intense game of reproductive competition.

"Professor Conducted A Huge Study To Find Out Why People Kill" by Erin Fuchs, www.businessinsider.com. February 17, 2013.
Killing is fundamentally in our nature because over the eons of human evolution murder was so surprisingly beneficial in the intense game of reproductive competition.