NPR's Morning Edition reports that using hard data to convince people who believe vaccines cause autism may help them acknowledge the benefits of vaccines... but it doesn't help increase their use. It seems that mental acknowledgement of ignorance is one thing, but... doing something about? Not a chance.
This reminded me of a conversation I had with a friend once about the fact that we didn't believe that "irregardless" was a real word. It was just a word we didn't want to use because we thought people who used it sounded stupid. Apparently irregardless is a real word (watch the funny video below)... but I still won't use it.
So, regardless of the fact that vaccines don't cause autism, some people just refuse to get vaccinated. Just because.