Haha, the thing about the Nazis and Communists made me laugh.
There were many fluoride consumers that were actively struggling against their leaders. The thing is though, when you have a ruler capable of eliminating you from history, you tend to stay quiet.
Many Hoaxes are born simply because of lack of scientific literacy. Nathan Zohner gathered petitions to ban Di hydrogen Monoxide for a project entitled "How Gullible Are We?" It's water! If people actually asked a Medical professional, there minds would be put at ease. There are so many Old wives tales out there: Aspartame giving you Cancer springs to mind.