Don’t be a tinfoil hat idiot. Several important factors known to raise the measured ASD prevalence rate reflect a change in ASD recognition as well as clinical and surveillance practice rather than a true increase in the incidence of the disorder.
“The main reason we are finding more autism is simple: Clinicians are getting better at spotting what was always there. There is no simple test for autism, so diagnosing it requires substantial training in observational techniques. As a result, diagnosis can vary significantly depending on the population and the competence of clinicians. A reevaluation of data from the mid-1980’s shows that 59 of 100 students evaluated would now receive a diagnosis of autism vs 4 of 100 at the time”.