Worse, it's not just the point of "school", it's the point of GOVERNMENT to force people to be productive citizens. Thus, if some parents aren't using a "schooling philosophy" that is expected to acheive the goal of "productive citizen", the people are expected to VOTE to force those parents to do something different to ensure their children become "productive" citizens.
I homeschooled and my goal was to raise a productive citizen. I guess it all depends on the meaning of productive.