RFKJ promised to reveal a cause of autism in September. He's trying to hit his mark. As far as motivating a bogus assertion, I think that the point is to blame people for having autistic children. Oh, your boy is on the spectrum? It's your fault for taking Tylenol. Hide that hideous monster away, you moral weaklings!

Also insurance will be able to quibble over paying for any treatments. Parents will avoid a diagnosis by any means possible, and work hard in secret to make sure children don't display any telltale signs. Schools won't have to do anything to accommodate the mutant Spawn of immoral failures. It's a win all around!