The truth about a lot of things, our history for instance, has been known for a long time too. Yet there are still (most) people who think the Civil Rights Act was a good thing, or that Abe Lincoln or Teddy Roosevelt were good men. I could go on for hours. The problem is that most people believe what they have been taught. He explains in the video that medical doctors are taught certain things as fact. Vaccines being good medicine are one of those things.