have committed and, if they are not taught, it is quite natural to try not to think of them, anyway. Human beings are the most inhumane animals on the planet without regard for race, creed, nationality or religious affiliation. What they can do to each other by dehumanizing each other, (which, by the way, starts much the same way you have just tried to dehumanize the American soldier), is very much unthinkable.
There is no excuse for the behavior of these Marines in Haditha, but they are by no means the first and only warriors in the history of warfare to go beserk. It is because of their nature that they committed these crimes, not their nationality. (Although, I will concede, had their nation, my nation, not committed the attrocity of making war in the first place, this surely would have never taken place, but that is not what I am talking about here.)