If people are going to start bandying about unproven theories they've simply found on the Internet about the possible causes of autism, then why are we just limiting it to vaccines? I know how to use Google better than most people - I'm a journalist, after all - so let's see what else I could find...
[about eight seconds later]
People, we're starting to enter unhelpful territory here - we have to accept that medical scientists don't yet know why autism rates appear to be rising, just as we have to accept that the overwhelming evidence shows that vaccines are not to blame. If you're afraid that vaccinating your children will make them autistic, you ought to be comforted by this knowledge. Besides, Wikipedia - that great, omniscient cyber-being that makes experts out of all of us - tells us there are many other things to worry about instead [see above link].
Please, if you're wary or unsure, talk to a real doctor - not Dr Google.
Good night, folks - sleep well and worry about your Christmas credit card bills instead.