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In early 2015, the California Department of Public Health identified a case of measles in an 11-year-old who had recently traveled to Disneyland. Within a month, at least 125 US residents were stricken with the disease. About a third of them had visited the Magic Kingdom theme park, many were unvaccinated, and the outbreak spread to Arizona, Colorado, Nebraska, Oregon, Utah, and Washington, as well as Canada and Mexico. This burst of measles prompted much public discussion about vaccine hesitancy. Yet Robert F. Kennedy Jr. dismissed concern about the outbreak as “hysteria.”
At the time, several state legislatures were considering measures that would limit vaccine exemptions, in many cases ending the ability of parents to skirt immunization requirements for their children by citing a personal belief (as opposed to a medical reason). As one of the most prominent anti-vaxxers in …