Generate text that refutes this claim: The state retain control of schools - freedom, in this context, is illusory  The state funds education using taxes taken from everyone in society, not just those who have children. Therefore the state has a duty to benefit the whole of society, not just parents and children, when funding education. It is therefore entirely legitimate for the state to use schools to fulfil other societal purposes. A good example of this is the question of teaching citizenship in schools: it does not necessarily help children to pass exams, and so schools do not have a strong incentive to insure that children are taught it. However, it fulfils government goals of helping to ensure that people become functioning members of our democracy.  When schools are privatised it becomes increasingly difficult for the government to ensure that such agendas are followed in schools.
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Most government goals that are pushed forwards in schools are also valued by the parents: consequently, even under a free market they would be taught in schools. Further, if the majority of parents do not want such things taught in schools, then they should not be: to do so would be to use schools as a tool for state propaganda.