Considering the lack of people walking here I'm sure the stores would hate to have to guard a second entrance. Especially one barely used.
It's easy enough to design an entrance vestibule to be entrance only, and force exit via walking through and past a single set of centrally located cashiers.
Farm Boy, like most grocers, is configured to have a long corridor that you exit by, after having got through the cashier area.
Putting an exit at each end does not pose a serious obstacle or materially increase theft.
It does, however, consume square footage that would otherwise be selling space.
Here, to serve both the parking, and the road, you would run the internal corridor parallel to the driveway and put entrances at both ends.
Visually, it appears they have chosen not to do that here. Which is a shame.