I think its a matter of scientific education of the general public. Vacinations do carry risks, but the risk of having the diseases is rather greater.
Whether the MMR causes autism, I have no idea. However I am sure that mealses can damage the brain in such a way to mimic autism. Certainly mealses can lead to mengenitis.
In fact I know of a lovely young boy who was brain damaged by mengentitis at the age of 8. He is a lovely little boy, but he has virtually no speech. He will never live independently or be able to hold down a job. Its very tradgic.
Even if the MMR has caused autism in 12 kids out of a million, but has probably saved more kids from major disablity or death.