I strongly recommend this recently published account in Popular Mechanics of a reporter (and her photographer) going on a cruise with a bunch of conspiracy nutters. It turns into a real problem when they become the victims of paranoia.
Most surprisingly - Andrew Wakefield (he of the discredited autism/vaccine link) was one of the speakers, and while he is only a bit player in the article, he really does not come out looking good.
Reading this reminded me of something I perhaps didn't say here before - the absolute worst aspect of the new series of X Files was its incorporation of a secret government vaccine conspiracy (not Scully's unflattering hairstyle.) Yes, even worse that its having a conspiracy broadcaster who actually was onto something, I reckon it's a disgrace to give any encouragement at all, even in fiction, to any dimwit watching (and they are out there) to the belief that vaccines are evil and to be avoided.