I have to agree that he shouldn't have shot him 5 more times, BUT. You just got held at gun point and the adrenaline is pumping pretty good, coupled with fear and every other emotion going through him i don't think anyone would be thinking 100% clear. As far as I'm concerned they waived any of their rights when they decided to go and steal from someone who had worked hard for what he had. What he did wasn't right but he absolutely shouldn't spend the rest of his life in prison.
All that being said, hind-sight is 20/20 and none of us were in his shoes at the time it happened.