Well, when your two choices are to shoot up wild hoodlums that are threatening your way of life or have your family slaughtered, dropping hellfires on the people you're told are the enemy seems like a no brainer.
Just remember that any weapon needs an operator. I think people who assume US troops are going to be willing to shoot up other Americans are mis-estimating things. I know it happened 150 years ago, but I suspect (hope?) things are different now.
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