The purpose of a public school is the opportunity to educate children at little to no out of pocket cost. It has nothing to do with specifics of the tax system,

The purpose of a public school is the opportunity to educate children at little to no out of pocket cost. It has nothing to do with specifics of the tax system, or whether a voucher program exists. Also, if you are American, voluntarily donating money without oversight to a local school has as much return as breast cancer awareness.