Putting fluoride in water promotes freedom. That sounds crazy, but let me justify it. If you are poor you can't go anywhere or buy anything. You're not free if you're poor. If you are sick, you may be confined to a hospital bed or not feel good enough to do anything. If you are sick you're not free. Putting fluoride in water reduces dental costs and incidence of cavities and therefore tooth infections, particularly a…
The inviolability or integrity of one's own body to me is more important than any of this. You have the right to decide what medication to be given to you with informed consent always, or you have no freedom. Otherwise the freedom argument collapses and you stop having reasons to allow abortions, or a bunch of other informed consent situations.
And "knowing better" than poor people "for their own good" usually doesn't go well (for the people).