https://en.wikipedia.org/wiki/Agnotology is a good word to refer antivaxxers and the likes to, thanks @digit@joindiaspora.com
just like tobacco industry developed and learned much of the science of dispelling truths and instilling lies, a textbook case for the science named agnotology, others have come to exploit for profit such techniques to get people to doubt actual science over rumors, at their own peril.  the technique is developed to the point that believers in the contradictory claims become blind to the contradictions, and believe it's those who can see the contradictions are the actual victims of manipulation, rather than themselves