There was an article recently talking about people who prefer to get their health info by watching garbage on YouTube that reinforces their prejudices against vaccination.
While it would be nice to think that they're standing on Darwin's doormat screaming "TAKE ME! I'M TOO STUPID TO LIVE!" there is the problem that when you get an entire herd of idiots leaving themselves vulnerable to things like hepatitis, tuberculosis, various flavors of measles and the flu, the general breakdown of public health that results will eventually take down the rest of us.