As I pointed out before, autism was originally associated with the MMR vaccine on the strength of a study by Andrew Wakefield in Britain that covered all of 12 children. Subsequent studies showed NO association.
But now we see that autism has become the new cause celeb, and every vaccine is blamed. It's pretty sad, especially since, as you said, we don't know what causes autism.
You need to do some more research. He studied another 160 children and he believes there is a connection but he's not sure of all the specifics. You are grossly mis-representing the findings related to Wakefield's investigation.
Oooops, nevermind!