What are the health concerns regarding fluoride in drinking water and why do people continue to support its use despite potential risks?

According to Adam Curry, fluoride is a neurotoxin and byproduct of aluminum production that was added to public water supplies to combat tooth decay caused by sugar consumption. He argues this solution is fundamentally flawed and dangerous to human health. Curry highlights conclusive studies showing direct correlations between high fluoride levels in local water and lower IQ levels in populations. Despite this evidence and fluoride's classification as a neurotoxin known to be harmful in large doses, many educated people continue supporting its use in water supplies. He attributes this phenomenon to blind faith in "experts" and systemic endorsements, even though history repeatedly shows experts can be compromised or wrong. This creates a troubling situation where people defend a potentially harmful practice simply because it's part of an established system backed by authorities.