Well, it's a mystery as to what you deem has been "legitimized" about the nonsense in your previous post, but far be it from me to try to decipher the antifluoridationist mindset.  

Yes, there is no concern with water fluoridation.  The "continued debates and challenges" are from antifluoridationists, whose opposition  is grounded in the same anti-government ideology persisting since the very beginning of the initiative 71 years ago.  The arguments are the same ones repackaged for each new generation of these activists.  The difference now is that the internet has enabled them to disseminate mounds of misinformation all over the world instantaneously.  

When there are activists deluding themselves that their opposition is based on something other than self-serving personal ideology, who have no respect for truth and accuracy, and who have no compunction about creating onslaughts of false claims and misinformation, you will have challenges.  

Steven D. Slott, DDS