This is one of those cases where it really sways me. It'll all come down to exactly what happened. First and foremost, if someone is going to cause harm to me - I'm taking them out. However, once they are subdued i'm kicking the weapon away and keeping a gun aimed at him until police arrive. If he is fatally wounded on the first shot, nothing to worry about. If he is trying to get up and cause harm again, by all means defend yourself.
This sounds like the store owner let the primal instincts take control and lost control. If the robber wasn't moving or severely wounded, you don't casually (from what the video looked like) walk over and pump him with 5 more rounds. If it comes down to where this is the case, sorry...he crossed a line and goes away.
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