Abstract

Some parents take advantage of legal exemptions for the measles-mumps-rubella vaccine. While there are a variety of reasons parents do so—including having children with medical conditions that make vaccination medically unsafe—some parents appear to be driven, at least in part, by beliefs that vaccines cause a variety of diseases or conditions, such as autism. Those who delay or refuse the MMR vaccine because of false beliefs about its side effects elicit a strikingly strong response from many who endorse MMR vaccine mandates. Accusations of moral wrongdoing, expressions of anger, indignation, resentment, or disgust frequently appear in social...