I hadn't watched that video before - thanks for posting that.
The guy who jumps in near the end and gets off a couple of shots is clearly a case of negligent discharge.
This video is a perfect argument for why people ought to be stocking up on 30.06 AP. Problem is ( haven't seen any stories that give any detail on this) - the Marine who go shot could have simply been walking down the hall of his home - with the AR in his hand (cleaning it, showing it to a friend, etc) - when the police show up, bang on his door a few times, yell out some stuff that may or may not have been intelligible - then break in and gun the guy down in a fusillade of bullets.
I bet a lot of people who are just walking around their home in their underwear - are not on full red alert status (hence ready to shoot back).
That's what makes this an execution. It doesn't go down like the movies portray it. They come up, no warrant - surprise you - then they are in the house and shooting at you before you know what went down. Do one little thing stupid - and you die.
Way to go America!
Happy Memorial Day. R.I.P. another Marine.