No, you're right they would have killed our guys given the chance. I don't feel sorry for them. I just feel for our guys because they've got this ethical thing that they have to deal with in every instant of every moment. I understand our soldier killing that wounded insurgent who he said was "playing dead", I'd probably do the same thing (also heard on Fox the insurgents are booby-trapping dead bodies, injuring our guys), so it comes down to kill or be killed in a split-second decision.
How do you win a war against the worst of mankind in such a convoluted pack of wolves?
It's actually pretty simple, just rather awful to contemplate, perhaps even harder to steel oneself, let alone a civilized society, to actually do it. The German word is Vernichtung. In French, guerre a l'outrance. In plain English, you exterminate them.