Many families are one parent, working more than one job. Kids are coming home alone, waiting for supper, waiting for mom or dad. Two or three hours of homework is the norm. This hasn't changed in 40 years. Why do thousands of kids run through halls carrying tons of books when a hundred teachers could walk to the classroom and books could stay in that room.
Homework is schoolwork, so keep it in school.
Many children could benefit from a few changes. No more latchkey kids, and kids with back problems won't become liabilities in a few years. New high school hours will teach the kids stricter rules than trying to get out of work in the middle of the afternoon. It could be more beneficial than anyone could imagine. From the teachers I hear this same excuse all the time.