I haven’t heard about this being played much in Florida. Of course, we have over a million concealed weapon carry permits issued down here. And there was that Trayvon Martin thing...
Likewise here in GA. About 5% of the adult population has a concealed carry license.
The Mexicans will apply their California solution to their part of the problem. The Redneck Whites won't be bothered very much, if any because the White Liberal and self hating Whites will provide them with entertainment for months if not years.
The authorities? The authorities will side with the animal crowd in every case.
Unfortunately, concealed carry won't necessarily help defend against the "knockout" game. They target people who are alone, and often strike from behind - the purpose is to attack and knock the person out before they have a chance to respond (really, before they even see the punch coming). A concealed weapon can help if you see the attack coming, but the key defense is situational awareness .