Well then, how about just letting the police mow them down? They are the proxy enforcer of individual citizen's rights. If the shop is vacant but being looted, the police act on the behalf of the legitimate occupant.
I guess now it sounds like a big violation of the rights of man. But in reality where I live, a life is a life, and if the action is justified, it really doesn't matter who runs the weapons. The value is equal, the damage is equal, it's just different people performing the act of slaughter for a mediocre pile of replaceable property.
I'm all for defending life and property, but you have to realize in a mob scene like that, it's a different deck of cards entirely. You are not being woken up out of a sleep with no warning. If you have a weapon, it's probably best to use it to ensure your safe departure. Hosing down unarmed civilians, you're just gonna enrage them, and they'll probably burn you out and tear you apart.
Your machine gun won't be worth dick when they're running a garbage truck backwards through the front of your shop, hell bent on killin' your fuckin ass.