A Republican National Convention platform committee has declared pornography “a public health crisis.” Committee members don’t seem to know what “public health” means.
Lately it’s been liberal Democrats who have applied the “public health” label to everything they don’t like — smoking, obesity, venereal disease, motorcycle accidents, and more. They see “public health” as a blank check for government action.



The meaning of “public health” has sprawled out lazily over the decades. Once, it referred to the project of securing health benefits that were public: clean water, improved sanitation, and the control of epidemics through treatment, quarantine, and immunization. Public health officials worked to drain swamps that might breed mosquitoes and thus spread malaria. They strove to ensure that water supplies were not contaminated with cholera, typhoid, or other diseases. The U.S. Public Health Service began as the Marine Hospital Service, and one of its primary functions was ensuring that sailors didn’t expose domestic populations to new and virulent illnesses from overseas.