It's war. As I recall we didn't set up little court rooms on the beach at Normandy do hold a trial for every German we were about to shoot, nor are we doing that now in Iraq. The enemies of freedom learned long ago that all their soldiers have to do is take off their uniforms and all the pinko westerners like you will accuse our soldiers of murder when we shoot theirs.
We did not shoot German and Japanese POWs, which would be the correct comparison.