You have enough financial security that you can buy from "ethical" stores even if they're more expensive than other options.
You have reliable enough transportation that you can get to "ethical" stores even if they aren't within walking distance or on public transit lines.
You have the time, and energy, and information resources, to identify what stores meet your ethical code and what don't.
That's all privilege. You realize that's all privilege, right?
And if you're going to look down at people who shop at businesses whose ethics they disagree with, I say, with kindness but very sincerely, check your privilege.
(And then there's the less important point of relative privilege, and how someone desperate enough to steal food needs that food more than the store owner needs money for the food, no matter how good a person the store owner is, because to each according to their needs, right?)