Pennsylvania

I take it you don't live in Pennsylvania? We're the last state in the country that still has state-run liquor stores for spirits and wines. Beer is sold through beer distributors. (The short answer is that there's a very strong union of PA state store employees that is preventing this from happening.)

In the last 10 years or so grocery and convenience stores have been able to get single-serving beer and wine pouring licenses because they could prove to the state that they were also serving food to the public. As I explained in my OP it's become a huge problem in certain areas of Philadelphia where homeless people are abusing. It doesn't happen in other areas of the state (that I'm aware of), only in Philly.

Even if we did change our state laws and allow private ownership of liquor stores, it wouldn't solve this particular problem. Private liquor stores wouldn't be allowed to sell single-serves of wine and beer, because that requires a restaurant/bar pouring license.