What I would say is: "I assume that people who don't put the same value on the principle of self-sufficiency that I do would support a scheme to allow people of lesser means to buy groceries on the open market at a lower price than is permitted to me."
I like it: a philosophical take.
What I would say is: "I assume that people who don't put the same value on the principle of self-sufficiency that I do would support a scheme to allow people of lesser means to buy groceries on the open market at a lower price than is permitted to me."