Perhaps a little racism is at play? The soldier was hispanic, I havent seen the video as I have a poor connection, is the deputy white?
I can't see much on the video, but, if a cop shot me after telling me to "get up," the reason why wouldn't matter much, unless he thought he was acting in self-defense. But it's pretty clear on the video that he wasn't.
The deputy was probably some freeper from the immigration threads.