If the robber isn't threatening lives yet, I don't know if it's wise to draw your weapon and potentially start a shootout like this one. Assuming the robber was planning to just grab the money and run, then if the armed customer hadn't drawn he probably wouldn't be in the hospital with bullet holes now, and the other guy wouldn't have lost his life over a hundred bucks from a cash register. That said, if there are signs that a robber is getting too violent (which may have been the case here, I don't know), then that's probably justification for response.
Btw, I'm not saying that we should let criminals get away with this behavior, but this is the sort of thing that the liberals like to use as an example of "how armed citizens only create dangerous situations and how much safer we'd all be without them." So for our own sake, let's use our weapons in moderation.
Glock Lite. Please shoot responsibly.
Well said, sometimes its better to just stand back and be a good witness instead of endangering lives. If noone has been hurt let them take the money and go. JMO