This American Life recently did an episode on people who ruin it for everyone else. They bravely ran a segment about a family that didn't vaccinate their children.
There's a group of paranoiacs out there that believe that vaccinations cause illness, particularly autism. The fact that this is not true is not a concern for these people. There are a group of celebrities who go around on talk shows to spread these lies.
These people kill. When you don't vaccinate, you expose other people to potentially fatal diseases.
Celebrities like Jim Carrey, (one of the paranoiacs,) are responsible for more deaths than any serial killer using traditional means.
The fact that the "arguments" used against vaccines make a mockery of science and reason only disgusts me further.