Police have been known to riddle an assailant with multiple unnecessary rounds in the heat of action, and we've all seen films of Navy gunners continuing to fire at kamikaze planes all the way down into the water when it was clear they no longer posed any threat, but other planes did.

I don't THINK I could go back and finish off the wounded man by shooting him repeatedly, but I have no idea how I would react in such a situation. I don't even know if I would freeze and not fire at all, as even trained infantrymen often do in their first action. In this case, the shooter was taken by surprise, and reacted instinctively, and I am inclined to give him the benefit of a doubt. His reactions are clearly unrelated to his politics, which, of course, we have no way of knowing.

It's the stereotypical Rocky Raccoon "I'm gonna git that boy" reaction that I alluded to, which I find as distasteful as the equally sterotypical
"he was a victim of racism and poverty" whitewash.