You said:
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On the contrary, your thesis goes against our everyday experience, not only because we know people who are stupider than us, but also people who are much smarter than us.
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This reminds me of how a couple of hundred years ago it was obvious that the earth was flat and how we were the center of the universe.
It reminds me of how water is wet and how fire is hot.
I think you'd be better off introducing some supporting evidence if you wish to discuss your hypothesis that everyone has the same potential for intellectual greatness.
I said: I'm not trying to prove your thesis is false. I'm saying that your thesis is not obviously true. So instead of assuming people have a hidden agenda, you need evidence to convince people that your thesis is true. But I'm repeating myself...
This reminds me of how a couple of hundred years ago it was obvious that the earth was flat and how we were the center of the universe.