Your rabid dog analogy stinks.
I have no clue what happened. I have no clue whether this marine was justified - whether the terrorist was armed or whether he looked like he was reaching for a weapon or whether the Marine executed the guy. I do think airing this video is irresponsible - this stuff should be dealt with by the Marines. I'm not saying we shouldn't learn about it, but I think we should learn about it in the context of the entire attack unless for instance, this was common policy - Marines offing wounded enemy combatants for the sport of it. I also don't think this Marine should be tried by ratings-driven network and cable news shows. This should be handled by the military police and the Marine's CO.
I call 'em as I see 'em. Reality is a bi*ch sometimes.
I agree with the rest of your post, and what would disturb me also would be...
Marines offing wounded enemy combatants for the sport of it.
Besides the ROE, it is all a matter of intent.
5.56mm