The difference I think is that neither of the things you mentioned are essential inputs to a nutritious diet. Seems less defensible to be stealing non-essentials.
Interestingly, in one of Eric Bogosian's routines from 'Pounding Nails in the Floor with my Forehead' one of his characters specifically calls out eating Haagen Daz and Slim Jims.
I think the reasoning goes they're small and high-calorie.
The poor live in food deserts, they don’t have nutritious food.
They get their food from McDonalds, Dollar General and Taco Bell.