This paper analyzes the case of public anti-vaccine campaigns and examines
whether there may be a normative case for placing limitations on public speech of
this type on harm principle grounds. It suggests that there is such a case; outlines a
framework for when this case applies; and considers seven objections to the case for
limitation. While not definitive, the case that some limitation should be placed on
empirically false and harmful speech is stronger than it at first appears