You are completely misrepresenting what I said. I never said everything was good for you, and I'm not sure where you even pulled that implication from. I said fluoride naturally occurs in the body. In proper doses, it certainly isn't harmful. Too much is certainly bad for you. As is too much water... which can kill you.
It doesn't matter if it's proper amount of fluoride is good for you. In long term, it really adds up. Exhibit A: Person who smokes meth once a year. Not very dangerous right? But in long term, you'll lose teeth, black eyes, skeleton looking pal.
This doesn't make any sense at all. It absolutely matters if fluoride in proper amounts is good for you vs rat poison. Comparing fluoride to meth doesn't make any sense. Fluoride is a naturally occurring substance in the body that you need to have in certain amounts; meth is not a naturally occurring substance in the body that does significant harm to the body in any amounts.