In voting Thursday on whether to leave the European Union, the British people face perhaps the most momentous decision since Henry VIII broke from the Roman Catholic Church in the 16th century so he could marry as he pleased. Though lust is not the motivation this time, there are other similarities. The Catholic Church five centuries ago was run by an unelected supranational elite, answerable to its own courts, living in luxury at the expense of ordinary people, and with powers to impose its one-size-fits-all rules despite the wishes of national governments. We were right to leave.

The...