This exact thing will happen when society collapses, and we will all call it survival of the fittest.
What would you have these poor people do? Sit on top of the rumble of their homes and watch their kids die of thirst and hunger? Watch them suffer from open wounds? Or take some water, some canned foods, antibiotic cream and gauze from a fully insured store?
The ones taking tvs and things like that are foolish, at least in the short term, but they may be able to trade those items for supplies later.
And do the scriptures imply demons speak Latin? Because that, specifically, is the part Catholicism made up.