Schools are in general funded by taxes on real estate--which in my opinion is not a good thing, but is the way it is in the US. The couples with infants on our block and the empty-nesters pay taxes for the school system, just like the families with kids in the public schools and families with kids in private schools.

I don't object to paying taxes for schools without having a child enrolled in them. However, I think that real estate taxation is not a good way to fund the schools.