He interviewed thousands of American infantrymen and concluded that only 15–20...

He interviewed thousands of American infantrymen and concluded that only 15–20 per cent of them had actually shot to kill. The rest had fired high or not fired at all, busying themselves however else they could. And 98 per cent of the soldiers who did shoot to kill were later found to have been deeply traumatized by their actions. The other 2 per cent were diagnosed as 'aggressive psychopathic personalities', who basically didn't mind killing people under any circumstances, at home or abroad. The conclusion – in the words of Lieutenant Colonel Dave Grossman of the Killology Research Group – was 'there is something about continuous, inescapable combat which will drive 98 per cent of all men insane, and the other 2 per cent were crazy when they got there'.}

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