Rach, conserving the movie shooting -
First , I think tha what americans like, that I find distasteful is the preference for this type of outcome to an outcome possibly involving law enforcemt with no actual gunfire. It would have been better all around if the police could have stopped this with no one getting hurt, even the bad guys. But tha wasn't an option, so this old man interviened.
Secondly, more liberal people, often with less actual experience, seem to fin a lack of 'fairness' offensive - it seems to be that it would be preferable to some people that the old man waited until the bad guys killed somebody, then warned them, then counted to 3 and then shot the one with the gun and found a bat so he could have a fair fight with the one with a bat. That isn't the way it works - there was a chance, maybe not a huge chance but a solid Vance that these guys would kill somebody. Every day there are robberies that go wrong and somebody gets killed even if every one of the victims cooperates. The old man had a chance and he took it. Good for him