I’ve talked about this before, I think, but it bears repeating over and over. If you are going to have a weapon you must practice with it. CNN had this article linked to a man who shot 6 times at a robber and missed each time. Fortunately he didn’t hit one of the passersby either.
Another note: as a lawyer I REALLY don’t think it was a good idea for the store keeper to say “I meant to kill the dude. I meant to kill him, trust me. Anybody trying to stick me up, if I get the chance to shoot him, I shoot him on the spot.” I hope he wasn’t quoted correctly. Otherwise, if there is any more trouble at his store and he does shoot someone he could be in big legal trouble.