About autism. One big factor is that the very definition has changed. The field of psychiatry is 99% fraud. They gather once a year and they literally just vote new conditions into existence and add/remove symptoms on a whim.
It isn't science. There is no scientific method and no form of rigorous peer review. So while I'm sure certain secondary ingredients in vaccines and other forms of "medication" are contributing to autism, it's also just that the definition of autism has expanded to the point of being meaningless and is being over-diagnosed.
It's probably the suicide bombings. And the wars in the Middle East. And calls to prayer that block traffic. And all the vehicle attacks on Christmas holidays. And what their holy text says. And what their priests are saying.