The Supreme Court's big school choice decision yesterday is notable mainly for its insight into the progressive mind. To wit, no fewer than four Justices seem to believe that all wealth belongs to the government, and then government allows citizens to keep some of it by declining to tax it.

At issue in Arizona Christian School Tuition Organization v. Winn was a state tax credit for donations to organizations that offer scholarships for private schools, including (but not exclusively) religious schools. A group of taxpayers...