My question:
Let's say that vaccines actually did carry some infinitesimal risk of causing autism. The rate of ASD affliction is something like 1 in 70: that includes autistic disorder (the classical "autism") and the conditions formerly known as Asperger's, high-functioning autism, Rett Syndrome, and PDD-NOS. So let's say that's your risk of vaccines causing some form of autism, about 1.4 percent.
Which, conveniently, is very close to the mortality rate of pertussis in infants and young children, about 1.6 percent. However, it varies among the vaccine-prevented disease: polio has a mortality of 2-5% in children but often causes permanent, crippling disability. Smallpox (which is no longer vaccinated since vaccines resulted in its eradication) had a mortality of 35% and caused permanent disfigurement in 65-85% of cases and also caused permanent health problems: arthritis and blindness chiefly among them.
The majority of autism cases are HFA, Asperger's, and PDD-NOS. While problematic, they are quite manageable. So even if the vaccines do give your child an ASD, it's most likely to not be a huge deal.
So let me ask you this: is autism really so terrible that you would rather your child risk death or being permanently crippled than accept a lower risk of having a (probably mild) ASD (even if that risk did actually exist)?
You know, I don't want to be all social justice warrior here, but as someone who actually has Asperger's I can tell you I certainly prefer it to being in a wheelchair...or, you know, dead. Death from preventable disease, or infinitesimal chance of probably mild autism, and the miniscule chance their child will develop autism is so repulsive to these people that they'd rather their child risk death.
Assholes.