I've lost good friends in Afghanistan.At the hands of Taliban disguised as policemen,I don't recall people on here calling for them to be given life sentences.So good for you,you survived,my friends didn't.Maybe now you can understand why i think this is utter garbage.
Vengeance isn't the job of the army. It's there to enforce the political will of the government. As it stands, we are signed up to many different military conventions that expressly prohibit conduct like this and it was rightly tried as murder. It's utterly irrelevant what our enemies or opponents do as long as we obey our own laws. Murder is murder regardless of who's on either end of the gun.
Also, discipline is what saves lives. An idiot with a gun is an utter liability who doesn't deserve to wear a uniform.