If he was already dead, what is the problem with another bullet?
There is no such thing as an innocent terrorist. I heard that word applied to this "dead" victim this morning on Fox. That's right, he was referred to as a terrorist. They have a history of bobby-trapping themselves or others.
I'm certainly NOT going to sit in the comfort of my leather chair behind my computer screen, and sit in judgment of this young marine. He did what he needed to do. JMHO