I believe that this officer made some bad judgement calls because he was to afraid of the consequences if he didn't make exactly the right call and it very well could have ended in his death.
The only reason he's not dead is the perp didn't have a gun or didn't want to kill him.
No reasonable person, watching that video could fault him for pulling the trigger.
That's not the point. The point is that there's a reasonable argument for him NOT pulling the trigger, too.
And like I said, if you want to interpret two tours as a Marine in a combat zone with a Purple Heart and no other info as a probable desk jockey, you go right ahead. Just own your own opinion.