If we allow a measles virus reservoir to become active in the non-vaccinated population, we run the risk of rapid mutation into strains that overcome the immunity in vaccinated people. Then everyone is at risk. Having everyone vaccinated prevents the possibility of a measles epidemic. Prior to the vaccine, 3-4 million cases of measles occurred in the United States each year. Of those 3-4 million cases, about 450 people died each year. In my professional opinion, contagious, disease causing viruses have no rights. They are not fluffy bunnies or playful pups. They are the closest thing that we have to aliens on earth. They kill and should be exterminated!