Consider that autism is a result of both genetic and environmental factors. Even identical twins aren't always both autistic, even though there is a higher probability that the other sibling will also have it. Personally, I believe that some types of vaccines might be triggering autism in some cases, that there are a subset of people who probably did become autistic after certain vaccinations. The DTP vaccine is a more likely culprit as a triggering agent, than the MMR vaccine. Neurological problems are a known problem and are amongst the listed possible side-effects.
http://www.vaccineinfo.org/pertuss/qandavax.asp wrote:
A person with a recognized, possible, or potential neurologic condition should delay receiving DTaP or Tdap vaccine until the condition is evaluated, treated, and/or stabilized. Although DTaP vaccine does not cause neurological disorders, receiving the vaccine can cause an already-present underlying condition to show itself.
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"Hitting bottom isn't a weekend retreat, it isn't a goddamned seminar. Stop trying to control everything and just let go!"