The facts are presented and linked in the article.
Major public health groups such as the American Dental Association, the American Academy of Pediatrics and the Centers for Disease Control and Prevention support water fluoridation, citing studies showing that the mineral helps fight cavities. Health groups also emphasize that the practice is safe.
Again, if you just read the article it covers these points. It discusses that the CDC does not mandate fluoride and it's not ubiquitous. It talks about fluorosis, and the health benefits of fluoride.
I can of course take care of my own teeth, but that's anecdotal. If the data suggests that fluoride in water is a safe way to reduce the prevalence of dental issues, I'm for it.