Chris Kyle rationalized and compartmentalized his behavior. Where the others saw the local populations as human beings, (even those who were trying to kill them), Chris Kyle considered them as evil vermin, beneath the level of animals. Even hunters give "thanks" after dispatching their prey in order to provide sustenance for themselves or their families and to assuage any guilt for taking the animal's life. When your prey is mere vermin there is no guilt to assuage.
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