Let me try to explain:  

Un-chlorinated water is dangerous to drink, much like your 90-mph example.  It can kill you.  

Un-fluoridated water is PERFECTLY SAFE to drink.  

For you, UN-fluoridated water is "dangerous" because it does NOT change the mouth chemistry of its drinkers.  That is what people like me find UNsafe about fluoridated water  --  it alters the body chemistry of the people who drink it. 

I think you mistake the position of a lot of us local people.  We are not "FOs"  --  for example, I'm not like you, I don't really care what people in other cities decide to do with their water.  

But when the water I drink every day suddenly got fluoridated, I looked into it, and was startled and disturbed by what I found, both medically and politically.  

You can drink as much fluoride as you like in Colorado, and welcome to it  --  in fact, I hope you ingest as many toxic "co-products" as your heart desires.  Just don't try to force me to drink it.