Since you mentioned intellect, freddy, lets have a look at the definition of a poison.
POISON
http://dictionary.reference.com/browse/poison
- a substance with an inherent property that tends to destroy life or impair health.
- Chemistry. to destroy or diminish the activity of (a catalyst or enzyme).
Hardly fits the common, let alone legal definition of water, does it!
That's why there is a poisons schedule monitered by the Poisons Schedule Standing Committee of the National Health and Medical Research Council (NHMRC).
There certainly are valid arguements against fluoride, fluoridation in particular and POISON certainly is one of them.