Many stupid people are too stupid to understand that they are stupid.
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There actually was a scientific study that proved this conclusively. Also, the Harvard study on Fluoridated Water showed that the “conspiracy nuts” in the 1950s were correct: It really is bad for you, and reduces IQ significantly over time. All these professors grew up drinking fluoridated water.
The study showed that stupid people tended to think they were smart, and smart people knew they were ignorant about many things.
It seems that one of the worst things we do as a society is to tell stupid people that they are just as smart as smart people.