Why are humans so inherently stupid?

Look at our government systems, people in general making choices that are so crazy, Pollution, killing an animal to extinction, procreation of degenerates, the list goes on and on. There is no logic that gives reason to humanities excuse for being so neglectful. Yet we all act like the chinese in killing thousands of sharks just to harvest their fins so the chinese middle class can enjoy a dish only reserved so Emperor's and Royalty.

I can't see humans surviving the next 300 years. 200 years yes we will probably still around but we will be reduced to sticks and stones. Fresh water supplies if you look at the rate of contaminations very few places exist.
Why are humans so inherently stupid?
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