Question: Should the government mandate vaccination? Advocates of free markets often disagree about whether vaccines are safe, effective, and necessary – and whether they could be justly mandated by law. One problem is that the refusal to vaccinate oneself might put others at risk. Not everyone can be vaccinated, and some people who are vaccinated don't develop immunity. However, when the vast majority of people are vaccinated, that provides "herd immunity" to people who don't have immunity. People who choose not to be vaccinated degrade that herd immunity and thereby put others at risk. Moreover, parents have to choose whether to vaccinate their children or not, and the failure to vaccinate is regarded as neglect by many people – on par with Christian Science parents refusing to give a sick child antibiotics. Given that, should vaccinations be mandated by the government? If so, under what circumstances? Or might people be held civilly liable for transmitting diseases? Or should vaccination be considered a purely private matter between individuals (and institutions)?