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A tactical aspect to consider in this situation is conversation of ammo. No matter how much you are carrying it may not be enough in a mob situation so don't waste it. Don't attract the mob to you by firing unless you feel threatened. A gun is just a expensive club once it is empty.
as I've indicated before, get your back to the wall and hope the momentum of the mob pushes past you.

In another post I read somewhere concerning a roit in a small town in the east where the chant by the mob was "beat whities" police were called, only one officer showed up and his efforts were not effective. Made me kind of wonder if maybe the other officers were delibratly late.

If its a flash mob just with the intent of looting a store, get clear and stay out of the way. If it's a mob determinedly beating people its still not your responsiblity to do anything to stop it. If the mob is taking an interest in you I would back to a wall and pull a weapon with the firm intention to fire if attacked. I would worry later about brandishing. whether I had to fire or not at this point I would be in fear of life or serious harm.
I try to avoid crowds or events which might get out of control.
Situation awarness. Avoidance is your best defense.