It's one thing for folks to say that the 1969 moon landing was filmed on a sound stage in Burbank or something. That's just nonsense that's easily disproved. It's another thing entirely to buy into all the anti-vaccination baloney. That hurts people, especially the young and vulnerable.
The anti-vaxx crowd doesn't seem to want to believe the mountain of evidence in favor of vaccination, and it's hard to combat that. But maybe, just maybe, the largest study ever on the subject of vaccines and autism might help?