I think this opinion is unnecessarily cynical. The people who navigate to school tend to have one or two school per year. They learn the route by heart mostly. Schools are not interchangeable for the one attending them. On the other hand, I don't keep track of grocery stores, and I'm much more likely to look for them on a map (especially to plan where to stop by along the road). There are more likely explanations here than to immediately jumping to the cynical interpretation.