That video can be looked at and different conclusions can be drawn from it. Its not at all clear that the shooter was going to "win" when he drew, in which case, its quite possible that the whole shop was going to go down.. Not very many instances end up this well, happily in this instance the good guy won. That said, under current gun laws, those guys had the right to do what they did and it worked out well that time.
As I've said in some of our other dialogue, I think you and a couple of others on this site have thought it through and gotten the proper training. I respect you and am not concerned about your attitudes or way you carry. Not so for the general population. I think its up to gun owners to build the culture so that practically all that own and especially carry take the same high level of training, thought and precautions that you do. Unfortunately, at this time, most don't. Right now, 1 in 3 gun owners don't safely secure their weapon at home. Guys drop their guns in checkout lines or behind the seat in theaters for crissakes. These guys are the picture of Barney Fife in how they handle and store their fire arm. The should be made to carry their one bullet in their shirt pocket, assuming they aren't wearing a stained white tee shirt.
Most telling, for every time a gun is used in defense, there are four instances of completely unintentional shootings (
http://www.ncbi.nlm.nih.gov/pubmed/9715182) not to mention additional intentional shootings of women by the men that "love" them and other shootings of rivals or in anger. The link I posted was only one of many that shows similar statistics. Its up to the gun owner nation to drive this ratio down. From everything I've read, for me and most people, owning a gun makes us statistically less safe. I don't believe that expanding gun ownership will improve this -- I believe the opposite. The only thing I can do is support restrictions in gun rights, which I will do every time I have a chance. If gun owners want to keep things the same or expand rights to carry guns, then its up to them to change the statistics. I can't.