"Just steal it, bro!"
And then what? No grocer is going to restock shelves that are just going to get ransacked again. So a week later you don't have grocery stores any more and you live in the Sahara of food deserts.
You might say you'll set up coops. Great, I love coops! But if grocery stores are such a social enemy, then just set coops up now and people in the community should flock to them, right? Then the daily exploiters will go out of business, and you won't have made people in the community suffer from a lack of food availability in the meantime.
I get it that it's more work than looting is, and doesn't sound as cool and edgy. But the way to develop your community sustainably is by building up, not by tearing down.