I admit to having only skimmed the surface of this thread, so I expect to be shot down in flames for this post, but I do get a distinct impression that there is a strong body of opinion that, because war is war, anything goes, and if you want proof, just look at every war that has ever taken place. Atrocities are inevitable and unavoidable: they are, perhaps, the essence of war.
Justification for the Holocaust at last!