Supreme Court Justice Antonin Scalia is a smart man and an excellent writer. He is also a living example of how bad political and philosophical premises can put great talent in the service of an evil cause. In November, while speaking at the University of Missouri, Scalia was asked what he thought about proposals to impose a national ID card on the American people. Scalia said he personally opposes the idea and would vote against it if it were put to a vote. But when a student asked him whether a national ID would violate the Constitution’s Fourth Amendment, which...