I'm not familiar with your school background, but I suspect a watershed distinction is rural vs urban districts. I've had kids in both, and in rural districts, the buses are important, but not as vital for in-town kids as in the metro areas. I'n the rural districts as many kids were dropped off by car or public transit as took the school buses. In the metro areas, the bus might be required or effectively the only option.
It's all speculation, but this isn't Podunk Kentucky; this is Louisville. This is really something a metro of nearly a million people should have figured out by now. But easy to Monday morning quarterback, and I do sympathize with the funding constraints and public apathy.