The evidence for "vaccines causing autism" is (a) child is vaccinated; (b) child is diagnosed as autistic; (c) therefore, vaccination causes autism. It's about as realistic as (a) child breathes; (b) child is diagnosed with autism; (c) breathing causes autism.
It's easy to have an opinion like this when you make sure that you don't look into any evidence contrary to said opinion.
There is enough evidence out there to warrant more investigation of a link, whether you want to look at the evidence or not.