The entire modern dialectic around intelligence is emotionally driven. Dumb/unsuccessful people want to believe that smart/successful people just got an unfair leg up in life. And smart/successful people want to believe that anyone can achieve what they did if society helped them enough. We don't want to accept that some people are born with what it takes to become elite and some are born without it and will never have it.

But the fact that most people aren't geniuses shows that being a genius doesn't confer that much of an evolutionary advantage. In fact it might even be evolutionarily negative - in general, more years of academic education correlates with having fewer children.