For what you're talking about above, intelligence = education.
"Natural" or genetic intelligence is somewhat of a fallacy. Across the human population there's definitely variance, but the vast majority of the population is fairly equal. Access to good education/resources and a supportive/encouraging (home) environment is what differentiates who ends up with what level of "intelligence".
So in terms of the nature/nurture debate, the nature side has been largely debunked in terms of "intelligence" outcome. (Eg: studies showing parents of high IQ don't necessarily produce children of high IQ).
So forms the basis of prioritising a good education system to the *entire* population, rather then a/any select group.
But hey, let's endlessly debate whether everyone should be allowed to have equal rights for marriage instead.
(Re: General reality, not necessarily the convo on here)