What is something that only exists because people are stupid?
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Science. If we weren't stupid we would already know everything and wouldn't have to study it.
edit: that was a joke, sorry if I didn't make it clear.
You are confusing knowledge and intelligence
Hard disagree. We have the scientific method to able to approach the unknown and slowly decipher it in a way that consistently gets us closer to the truth because we're at least smart-ish as a human race.