>>>"..a wounded, unarmed Iraqi, shot to death by a U.S. Marine." <<<
In addition to your point, this is the first time that I have heard that it is definite that the "insurgent" was unarmed. I have never heard that confirmed - he was lying a pile of rags and could have had a concealed grenade or a short barrel AK under the pile.
I have believed and will continue to believe that the Marine's action probably saved lives, including that of the slime-ball journalist who reported it as a killing in cold blood!
I think by unarmed they mean he didn`t have a weapon "in his hand".
The reason probably was because the guy was already dead and his weapon was taken by the fleeing insurgents.
The Marines actions were justified IMO too. Once the insurgents started rigging up dead bodies with explosive devices, any non moving person is still a threat until confirmed dead. A shot to the head would confirm someone is dead.