We can argue about the relative safety of fluoride to the human body. Maybe there's a middle ground somewhere, but saying that it is hazardous to your health in excess amounts and that those excess amounts can be found in tap-water isn't controversial nor is it misinformation.
For example, as a very basic, low-level example, exposing children to fluoride early on when teeth are forming causes dental fluorosis. This is well-known, well-studied, and not at all controversial. And in fact, tap water is the most common source of dental fluorosis.[1]
Now there are clear benefits to fluoride: It can be used in a variety of circumstances and probably has done humanity a net good, especially in areas where dental hygiene (for whatever reason) isn't well understood or well-practiced.
But there's clearly a level where it's not safe to expose to human beings.
For example, as a very basic, low-level example, exposing children to fluoride early on when teeth are forming causes dental fluorosis. This is well-known, well-studied, and not at all controversial. And in fact, tap water is the most common source of dental fluorosis.[1]
Now there are clear benefits to fluoride: It can be used in a variety of circumstances and probably has done humanity a net good, especially in areas where dental hygiene (for whatever reason) isn't well understood or well-practiced.
But there's clearly a level where it's not safe to expose to human beings.
[1] https://en.wikipedia.org/wiki/Dental_fluorosis