I suggest reading "On Killing" by David Grossman. It delves into the instinctual adversion to killing fellow humans and how we overcome them. Without giving away the bulk of the book, it basically says that it is hard to kill another person, so we have to basically 'dehumanise' who it is that we're killing. Also distance is key factor ie: it's easier to kill with a knife than it is bare hands, easier to shoot than to stab, easier to bomb than to shoot. With a knife studies have shown that people tend to slash than to stab, as it is less invasive less personal. The book gets far more in depth and actually backs these claims with battle field studies.
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Si vis pacem, para bellum.
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