There seems to be this mental block for certain people about genetics when it comes to anything brain-related. Genetics have an impact on your athletic ability? Of course! Genetics have an impact on your intelligence? Impossible!
I think people strongly want (need?) to believe that good things have happened to them mostly as a result of their own virtues which are of course entirely self-determined.
In fact if free will even exists (evidence is against) the scope for its operation to affect one's future is very narrow. We are who we are, and where we are, because of our parents plus a little bit of chance.
As societies we can decide (to some extent, if democratic) to redistribute wealth and strive for equal opportunities for all. This is a good thing for civilisation, by giving the best minds access to the best training and resources we can make more scientific discoveries and technological breakthroughs.
But is it "fair" in the sense that we all have equal opportunities to achieve greatness? Of course not, we are not all born into (genetic) wealth.
Do we even want less able people to be given the best education? If we would give everybody the same (perfect) education what benefit do people on the lower three-quarters of that spectrum get? You'd need a degree to get even the most menial jobs? That doesn't seem to benefit anybody.
A better idea seems to be "From each according to his ability, to each according to his needs". We should stop judging the value of a person by their wealth or their ability or their achievements. We're a very long way from that though.
Alright, let's talk about eugenics then? After all, it's not just Nazis that had eugenics programs in the newest history: the USA had forced sterilization well into the seventies, so it can't be all that bad.
Genetics don't determine that much as some would like to believe, seriously.