The bottom 75th percentile don't advance humanity to nearly the same level. Do you think you'd have the internet or iPads if everyone was capped to the 75th percentile? No.
Beyond this, the entire point of higher education is to push those who are able to higher levels, not to drag the 75% along for the ride.
> The bottom 75th percentile don't advance humanity to nearly the same level.
Who do you think produces all the value in the world? It's not the people organizing the labor, it's the goddamn laborers.
> Do you think you'd have the internet or iPads if everyone was capped to the 75th percentile? No.
What do you think we would be eating if we left the world up to the rich nerds? We would have starved many millennia ago.