Asked why the pharmacy only carries the pill in one state, Fogelman said that it was purely a "business decision" for Wal-Mart, based on its assessment that demand for the product was not very high.
If any store chooses not to carry any product, what business is it of the government? They're choosing on their own to sacrifice potential business and other stores are free to carry the product in question.
No store can carry every product, so they choose what they will stock based on expected sales. If they're wrong, they lose customers.
What's next, a government saying "You must carry Chee-tos?" It's the same logic. Just substitute someone with the munchies for someone seeking to induce a chemical abortion.