Just a heads up, I worked a little over a decade in San Francsico as a security guard against flash mobs. It's always racially organized on the pretense that security cameras and guards won't be able to recognize the all Asian or all Black population nailing a joint. It's the default- so people noticing flash mobs are all the same color it a moot issue. It's the way they are designed.
For me, it was former SF Mayor Lee's China Town Tongs who would walk a few blocks down the street to the square and start looting the stores I had to guard (Chanel, Hermes, places like that). I solved it simply:
I asked what had resale value and what didn't, was told the H Belts and Scarfs and Braclets, high end purses. Nothing else could easily be resold for lots of money. So I as the security guard chose the stupid $800 belts, and said when they storm in, everyone take a position and grab or lock stuff up- only the stuff with resale value. I would hug those belts as a flood of Asians overran the store. I told anyone if threatened, just give it up, not worth it.
Guess what happened? Every other store would get raided, and I got alot of confused Asians peering at me as I hugged the belts while their frantic buddies ran crazy grabbing at worthless stuff. They didn't want to steal from us anymore.
Also guess what? After I left SF these lessons were not preserved, and now armed guards with automatic rifles and ski masks at the very places I guarded stand. Why? Because they are stupid and lost control, and responded like idiots.
Do recognize the racial components involved but also do recognize the financial component as well in flash mobs. These are NOT RIOTS. A riot isn't this organized and technical in targeting. Instead focus on risk mitigation and denial of valued products. Banks do it, they have a safe. If they just left it stacked on a shelf in the lobby with a guard, people would be developing methods to take the guard down and rush out with loads of money. It's common sense, stupid nobody would try.
But while I encourage recognizing the racial component, don't just write the entire population of that race off. Most Asians are not thieves. I dealt with them the most. Same for blacks. They just have some weird Causi Belli for doing these hits, even though it's pure pragmatic financial gain. Asians don't care, and I'm unaware of a all white flash mob from personal experience but most thefts attempted were whites from my experience. They just don't culturally flash mob places I once worked. They do small teams or on their own.
Lesson learned.... a flash mob isn't spontaneous, it is almost always racial in design, but a very low minority of that racial group actually engages in it, and white people still steal more crap but in different ways. You solve it by out thinking the problem, not by pointing fingers at entire races. Tactics change.