When it comes to self-defense, the first thing we must remember is that we are not law enforcement. Our goal should be the defense of self and others in our immediate care (family, friends, and if you elect, nearby citizens).
So, here's my take on mobs:
1. They can form very quickly. Best way to defend yourself is to avoid them if at all possible.
2. Use brain to stay away from situations likely to result in a mob.
3. Use feet to remove yourself from a mob that forms around you.
4. Augment feet with diffusing personality. Bottom line, get out.
5. If one can't get out, don't let mob get within 21'. Take out the leader. If others charge, take out them too.
Key point: Item 5 might be illegal in your state. If so, you'll need to weigh your own options and make your own decisions. In my book, it's better to be judged by 12 than buried by 6. On a more personal note, if a mob is willing to attack me for being the honest, law-abiding citizen that I am, barring all other conceivable, reasonable, or reasonably perceived alternatives, I'd rather their feloniously criminal mobly butts take a bullet than me take a boot to my brain.