That's an excellent video, but you have a well lit area, nobody was running around because the bad guys obviously weren't planning on killing everyone in sight, and an open room. If those robbers came in shooting and everybody was running around it wouldn't have been that easy. Either way, props to the old dude for stepping up. Compare that to a movie theater. You have a foot of room between the seats, it's dark, you're sitting in the middle of the theater, there's smoke, and seats left down, a bunch of people's shit on the floor, probably bodies in the aisle, I don't care if you're ######ing Usain Bolt, you aren't going to get a good run at the guy unless you're lucky enough to be sitting in an aisle seat and no one is in your way, you're not blinded, you think on your feet fast enough and you haven't been shot already.
In this case the video shows the guy firing 6 times at 2 targets. For the first 2 shots he sneaks to within a couple of feet of the only one with a gun and then fires a few more close range shots at them running away. The result? 3 Superficial wounds in the hip, arm and buttock. Again, well lit area, no one in the way, open shooting lanes and area to maneuver, no body armor and most importantly no one is trying to kill him and everyone in there, and the suspects are still able to sprint away. If they were more bent on death and destruction like this ass clown that probably means the bad guys could keep on shooting and killing. I wish there were some brave dudes packing heat who could have popped this guy the second he started throwing shit, but this isn't an crappy action movie where the good guys always win and the bad guys can't shoot straight, it's real life.
Don't think that because he surrendered that he was a coward who wouldn't fight back. A lot of assassins and deranged shooters want immortality through infamy, but are willing to die or fight back in the process because they know if the stop the second someone resists they won't get that infamy from wounding 1 or 2 people. In this case he probably figured he'd met his quota and would just bask in the media attention in jail. Either way put him on trail, play a recording of his confession, drag him out back and put a bullet in his head and move on. Why can't these pieces of shit just save everyone the effort and put a bullet in their head before they plan something like this?