Why have some conspiracy theories been pushed back into the public? Because when you try to force them out of the mainstream, they'll find a wider audience on the fringes.
Liberal college students have taken to shouting down certain right-leaning speakers on campus that they don't agree with. Michael Shermer, the publisher of Skeptic Magazine, thinks that is the worst thing you can do. He posits that all you do when you prevent someone from speaking is make certain people want to hear them more. This has led to the rise of the conspiracy theorists and why fringe ideas—from something as silly as flat-earth believers to something as morally reprehensible as Nazism and Holocaust deniers—have been pushed back into the mainstream. Michael's new book is Heavens on Earth: The Scientific Search for the Afterlife, Immortality, and Utopia.