Mod parent down all you like, but cracking the numbers is actually a pretty good idea.
If the non-vaccinated kids have significantly lower rates of autism, we accept that the MMR jab is responsible in some way, even if we don't understand how yet.
If not, we accept that the whole MMR avoidance thing is utter bullcrap.
Sounds like a fair way to run an unbiased experiment to me.
They quit using the "mercury" preservative that purportedly causes autism over a decade ago, and the rate of autism diagnoses in young children has kept going up.
The doctor that started all of his has been shown to be a fraud, sponsored by an ambulance chaser.
Your experiment would be interesting, but it's not necessary. And the outcome wouldn't convince the True Believers anyway.