I'm all for the right to own guns. I own 2 handguns myself. But I also believe that if a gun owner takes out his gun and fires it when it is NOT a case of self-defense, he needs to be held accountable.
I'd throw the book at this guy. He was defending HIS CAR. That doesn't justify the use of deadly force.
Plus, they were LEAVING the scene when he came out and opened fire.