If you're interested to know how and why you've been conditioned to think that way, look up Edward Bernays and his involvement with getting fluoride into the water supply of a number of countries.
In short, he's known as the father of Public Relations. Fluoride can only legally be disposed of in expensive toxic waste dumps, and Mr. Bernays came up with a plan to dispose of it for free by passing it through the human body. His public relations skills were so amazing that he even succeeded in making people (like you) want to ingest it.
It's not science and just because you know a little bit about computer science doesn't make you qualified to speak about water fluoridation. Several countries have banned water fluoridation for the very reason that after decades and decades there is no causal link between water fluoridation and tooth decay.
You said they stopped it because there was no benefit. Do you have a source for that claim? Wikipedia (not a source) doesn't give reasons for the discontinuation of flouride.
Wikipedia does say that if you read further on, but unfortunately without primary sources. Unfortunately it's late here or I'd love to try and find some.
No, it's okay. You made claims which you then sourced to a Wikipedia article that doesn't say what you claimsd it said and doesn't contain references to what you claimed.
In short, he's known as the father of Public Relations. Fluoride can only legally be disposed of in expensive toxic waste dumps, and Mr. Bernays came up with a plan to dispose of it for free by passing it through the human body. His public relations skills were so amazing that he even succeeded in making people (like you) want to ingest it.