Perhaps if any of you ****tards had read Chris Kyle's book, you'd know (as does anyone who has been to the sandbox) that ANY shooting is subject to investigation by JAG authorities, so that every time he pulled the trigger, he documented (and had witnesses) to EVERYTHING.
Cold-blooded murder? Hardly. As he said, and as have others I've spoken to first-hand, it's not worth it. They let someone walk far more often than they'll pull the trigger.