Sure, they can talk about poisonous vaccines to Oprah or whoever is sitting next to them at the Lakers game all they want. They have freedom of speech. That freedom does not guarantee them a seat on a panel of experts.
Yet, this kind of stupidity happens constantly. You get articles like this one from the Toronto Star, explaining how an investigation revealed how World Trade Center building 7 collapsed:
Scientists with the National Institute of Standards and Technology say their three-year investigation of the collapse determined the demise of WTC 7 was the first time in the world a fire caused the total failure of a modern skyscraper.
The organization they mentioned, the NIST, studies how buildings collapse so that they can make sure future buildings don't collapse. But instead of going into further detail on their extensive investigation, we get this:
Mike Berger of the group 9/11 Truth said he wasn't buying the government's explanation. "Their explanation simply isn't sufficient. We're being lied to," he said. Ah, yes, the conspiracy nut. Again, we would never deny a crazy person the right to be crazy.
They just shouldn't get a voice equal to that of hundreds of highly-trained experts. It can't be done that way. After all, there is a contingent of conspiracy kooks drifting around every subject. You don't stop every story about AIDS in Africa to hear from the John Bircher who thinks AIDS is a secret government population control project spread by fluoridated water.
But we can't just disregard their opinions, can we? Yes. Yes we can. If you're going to weigh in on a scientific matter, you need to bring data, gathered by people who know what the fuck they're talking about. If the subject is medicinal marijuana, we're not going to quote a stoner who has suddenly realized his hands can talk.