The people performing those mind-boggling contortions to justify, on libertarian grounds, state violence against migrants without papers—restrictatarians, I call them—cite a 1994 article by Murray Rothbard (1926-1995) in support of their double-jointed acrobatics. Rothbard was correct about many things, but a position is not correct merely because Rothbard held it. I expect no disagreement over that. As a general matter, Rothbard's importance to the shaping of the modern libertarian movement needs no documentation. He was accomplished in economics, social theory, and history. In his time, he...