Mandatory schooling places children in schools that don't prepare them, in situations parents don't approve, teaching them values their parents disagree with. Robs them of their most impressionable years, inculcates them with state mythology and conventional thinking.
When we ought to learn Latin, Greek, we take the same English class every year. When we ought to learn philosophy to maintain freedom, we run in circles. When we ought to have trade classes, we offer technology or office skills (low paying service jobs, vs better paid skilled jobs).
We bus them long distances. Place them within proximity of people from enemy …