As I understand it, doing anything over and over numbs you to it. At first, you shoot those who are clearly soldiers, until some 10 year old, or woman rushes you with a gun, then everyone is suspicious.
From there, it's shoot first, ask question later. With a philosophy like that, I highly doubt that anyone is even a person anymore. Instead everything is a perceived threat with no humanism whatsoever. The claim of the men kicking around the severed head would be no different in thier minds to them kicking around a dropped gun. Both are just mechanism that threaten a soldier's existence.
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