The anti-vaccine movement was, only a few years ago, such a fringe group of cranks that even Donald Trump had to walk back his support for it once he was president. Now it seems to count among its allies at least three of the nine justices of the Supreme Court, who claim they are defending the free exercise of religion. One of America's preeminent defenders of religious liberty thinks that the Supreme Court is endangering that liberty in the guise of protecting it. Supreme Court advocate Douglas Laycock helped craft today's First Amendment law. Yet in the COVID-19 cases, the Court's conservative majority risks turning the free exercise of religion into something Laycock never imagined: a right to kill people.