The answer to your question is no. That's because everyone is affected by
water fluoridation. So why would people intentionally poison themselves?
Washington DC was one of the first cities to start water fluoridation. Back
then there was not a big bottled water industry. So most everybody drank
the fluoridated tap water - including all the powerful politicians.

What did happen was there were powerful interest groups that would
indirectly benefit from water fluoridation. In the 1930's there was an
effort to remove fluoride from tap water - due to scientific research which
showed harm. When an apparent benefit (reduced tooth decay) was discovered
and pushed forward the negative science about fluoride was buried, ignored,
and no longer funded. Once fluoridation became government policy in 1950
scientific reference books were changed to eliminate the negative effects of
fluoride. Suppression of science showing fluoride to be harmful went on for
decades. It is still going on.