Wouldn't a shotgun be better than an AR for defending a store against a mob? And wouldn't any sane person only try to do it if he had several friends, relatives, or hired muscle to stand with him and also wield shotguns? Wouldn't it make sense to board up the windows and pull down the security gate and stay inside the shop?
The only people I've heard that the mob beat were alone with one insufficient gun, or a fucking sword or something. Any chance these people are actually actors in the game, playing out a role to enrage whites into going all vigilante militia against rioters? Or are they really just dumb store owners who didn't think anything through? And never played any FPS game?