Teachers’ unions are pro-choice on abortion, but not on education. They use their enormous political capital with the Democrat Party to block voucher initiatives in whatever state or municipality proposes them, including in California. Consequently, many parents home-school their children at their own expense, even though they still have to pay local property taxes which are spent mostly on public schools their children do not attend. Right now, about 166,000 California children are taught at home. But last week, an California appeals court declared that all children must be taught by a “credentialed” teacher. It means that most home-schooling parents...