... few have denied that the vast majority of people find it extremely difficult to kill another human being. It is one thing to sit in a bunker in Nevada and anonymously direct a drone into attack with a joystick. It is quite another to track a fellow human being in the sights of your rifle or to stick a knife into someone's stomach. Natural human empathy generates huge psychological resistance to up close and personal killing. We have an inbuilt safety catch.
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