Earlier quoted context omitted.
High schoolers do not need daycare; they also do not need parents to dress them and get them to school. They should be able to manage those things on their own, and take care of themselves for a few unsupervised hours a day.
There are a lot of high schoolers who do not live within walking distance of their school, or who aren't safe walking to their school. Buses are unreliable, easy to miss, and public transportation can be expensive. It's a whole thing.
Because I am and I went to school by bus beginning with 12 years, and busses here are reliable (like "by minute reliable").