You aren’t reading the articles I cited.
In EVERY water supply there is F. Fluorosis is even why the whole thing about fluoride started, apparently. People with ugly mottled teeth were YET found to have cavity-free teeth that were very strong. (Hence, if it’s mostly a cosmetic issue, I’d hardly say fluorosis is a good reason to get rid of F.)
It was found that the people with stained BUT STRONG teeth had MUCHO F in the water. The doctors tried to figure out if there was a way to get the benefits (fewer cavities) of F without the costs (staining). The recommended level of fluoridation was discovered, and that is what it is. It is not at all high - if it were, lots of fluorosis would result.
Again - the F is already in the water! And in some places, it’s naturally higher than the recommended! I don’t think that killed anyone in those regions. Did TX have a higher death rate from “disease” (as varied cause as that might be) than NY before anyone knew this?