Do I feel a 642 is enough to carry? Sadly, with all the current mob trends that suddenly flare up over every single incident these days, and the hate, vitriol and sense of entitlement from people in general I'm seeing everywhere, which I believe are only going to get worse in the future, I would say no....Don't get me wrong, I love my 642, and about 15-20 years ago I would've been in solid agreement with everyone here that it would suffice for most SD needs. The J-Frame in my opinion is the finest discrete carry revolver there ever was...
I'm with you, Chris642. It's tough to beat a J-frame for carry. But times are indeed changing. Monday, I'm taking an autoloader to a training class for the first time because maybe in the back of my mind all of this tactical talk of "you need a double-stack 9mm or .40 and two spare mags or you might as well be unarmed and naked" is finally getting to me. Well, that and the fact that this particular school admits only students with autoloaders. I'm still very much on the fence, though. I haven't committed to "self-shuckers," and I'm never giving up my wheelguns.
As to self defense in riots and flash mobs, any handgun, whether having 30 rounds or only 5, should be the last resort. Police sharpshooters are looking to target "rioters" brandishing guns. Tactics are far more important. Greg Ellifritz (an active LEO) has posted what I think is an excellent and very thorough article on surviving riots and mobs. Mob Mentality?Escaping from Riots and Flash Mobs | Active Response Training
These days, it might be worth a read. And until someone finally convinces me otherwise, my 642 or my 64 snubby should be good enough for now.