Interesting thread! I'd like to hit on a few points and see what you folks think.
First as law biding citizens we comport ourselves with a certain mentality, we tend to be creatures of habit and try not to go in harms way. That said sometimes trouble finds you and despite your best efforts to avoid it, downplay it, insert "verbal judo", and try to deescalte the situation, these thugs only see a bleeding sheep they want to harm!
I've watched the videos on FB and paid very close attention to the Ferguson, Mo. Riots and can tell you I was armed during said events even though Ferguson is a bit from E. St. Louis.
Thing is to have a plan, keep aware of your surroundings at all times ESPECIALLY if your abroad of in a new local, have communications available at all times, and if necessary ATTACK!
Yeah I know it's supposed to be defend, but if you see trouble coming, exhausted all your options, called in the calvary and yet the miscreants are still intent on harming you or those your with, its time to engage them viciously and violently! DON'T get hung up on "What If" or "am I legal to do this" crud that will get you killed! Instead ACT! Let the police and lawyers deal with the aftermath. Remember your assailants aren't worried about the law, they only want your stuff or worse to make you bleed!
To them its a game, and you should chagr the rules on them! Warnig shots will get you tossed in jail for firing an uncontrolled shot! Use your ammo on the threat(s)! Tag the actors not the runners, and get to a safe place and tell shoe ers on the phone to communicate that your moving to safer ground.
Lastly as much as I admire the G19, my idea for a modern day snubnose .38 is the G26. It can take whatever Glock mag you care to utilize as a reload as long as its 9mm, same for the. 6906 and M&Pc.
Dale