As long as the taxpayer pays the school, he can decide what is taught. In addition, getting a decent education is a right for a child. There was once a school in California that switched entirely to a 'constructivist' education. So the students didn't learn facts anymore but were guided "to discover their own truths". Fortunately, since their education quickly was far behind students from other schools, the parents threatened to take their children out of the school and all went back to normal. But the problem is, what if the parents don't do that? Then you have children misseducated because their parents and teachers are idiots.