But anti-vaxxers are inciting physical harm. Why do we have laws to punish the extremist speech of potential Islamist and neo-Nazi terrorists but no legal means of stopping concerted efforts to persuade people to risk their own lives and endanger the lives of others? Concerted efforts, I should add, usually directed by the privileged against the poor and the weak.
The anti-vaxx movement punches down and punches hard. Its leaders tend to be men and women from wealthy backgrounds. Andrew Wakefield, the son of a neurologist and former fellow of the Royal College of Pathologists. Robert Kennedy Jr, son of the better-known, and better man, Bobby Kennedy. Or they have religious power, most prominently Louis Farrakhan from the Nation of Islam.