So, what's the over/under on when the violence starts, and can we bet on which product running out will trigger it?
This has been tried several times and it always, Always, ALWAYS, fails. The violence is usually not against the store. The violence is between the customers to each other. They fight each other over this or that thing. They rob each other in the store and in the parking lot. It always devolves into violence and chaos. There is no such thing as 'civility' in an everything is free store.
A free grocery store is, as the name itself says, a "free for all" store. Don't go in there unless you are ready to fight for what you get, or someone will take it from you.
It is the exact opposite of a nice and kind mom and pop store.