Being as how this happened in Arizona, I'd be surprised if there weren't more than a few people in the crowd carrying. I'm glad they demonstrated the good sense to not get into a major firefight in a congested area. I have no personal problem with people carrying for individual self defense, but the idea of one or two - or a dozen - untrained John Waynes all trying to get involved at the same time scares the crap out of me. Concealed carry classes do not teach anyone how to react in this kind of situation. The guys who manhandled the shooter to the ground and took his gun away did exactly the right thing.