could not the law allow a private school category where it is required that the school and parents enter into a contract to forbid voucher aid to the parents. In return, the school is categorically exempt from any government interference You're suggesting that the government would allow itself to be bound by a non-interference contract? Sorry, we know better. You don't get within a stone's throw of government money without government control; ask Hillsdale College.
I can't control what other parents do, or how their children turn out. It appears that a majority will put up with anything as long as they have somewhere to leave their kids all day. Without a major change of heart on the part of millions, we'll just have a growing number of bread-and-circuses zombies.
How free will any of us be? As free as owning land and guns can make us. Everyone has to die sometime, if it comes to that.
the government is bound by rules. The best example is the bill of rights. I didn't suggest that the governemnt should be a party to the contract. But the contract between the school and the parent might protect the school. Providing the school acts in good faith. The governemnt honors many types of legal status. Corporation are non-profit or profit. Bank charters or federal or state. Retirement vehicles are tax exempt under certain circumstances and legal categories.
Do you have a link or some source of information that expands on the Hillsdale College (your reference). I wonder how we can learn lessons from whatever this is about.
I am not going to launch into a counter offensive regarding your view of freedom. I assume you added it as an afterthought.