So-called anti-vaxxers believe that vaccination is harmful, as vaccines contain harmful "chemicals." A resurgence in once long-gone diseases is arguably attributable to a new wave of parents who refuse to vaccinate their children.
The problem is that many public school districts require children to be vaccinated before they can attend school. Because, you know, a parent's decision not to vaccinate actually has consequences for other children. But just ignore all that. An anti-vaccine case hit the Second Circuit Court of Appeals -- and, predictably, the anti-vaxxers lost.