If you want to claim "autism comes from vaccines" you really have to put up some sort of evidence that supports the claim, and the reality is that there is no reliable evidence for the claim. Also, which vaccine? They use a wide range of technologies? Is it thimerosol... which isn't in any of the major vaccines used in the US today (and was unlikely to be a cause of autism in the first place, and is also still used in many contexts).
Ultimately, what RFK Jr is doing is sowing doubt in established science. I think he's doing it because he thinks the established science is corrupt, but I fail to see how he could possibly correct that while also casting doubt. If he ends up in a public health leadership position, he's going to find very quickly just how poorly his approach to public health works.