Geosurface, I'm confused about what you're arguing here. Are you saying that we would benefit from instituting a eugenics program to ensure that only the best and brightest are bred together to create the most genetically desirable offspring? There's a few things wrong with that. First, there's the obvious moral implications of telling certain people they aren't good enough to reproduce, but let's ignore morality for a minute. What traits are desirable? Intelligence, athleticism, resistance to disease, family history of longevity, perfect teeth, hair, vision, height... There's a lot of different factors to consider when determining what's "desirable" and if we intentionally select for those traits, you start running into the risk you get with purebred dogs where a lack of genetic diversity in the breeding population reveals itself as undesirable traits that could potentially threaten lifespan. You may think that the Aryan Nordic type is the ideal, but they're a lot more susceptible to sunburn and malaria, which would be significant issues in tropical climates. Genetic diversity is important to ensuring the health of a population, and if you start a program aimed at achieving a specific ideal, you're intentionally limiting diversity; that's a terrible plan from a genetic standpoint.
And even if you manage to come up with a method of selecting ideal traits while maintaining enough genetic diversity to keep the population healthy, if everyone has a high IQ, who is doing our menial labor? As Judge Smails said in Caddyshack, "the world needs ditchdiggers too." There are a lot of jobs that are considered beneath the level of someone with a high IQ; if you start breeding a race of superhumans, who is going to be flipping burgers, cleaning bathrooms, stocking shelves, driving trucks, picking up trash and all the other menial jobs that geniuses don't want to do? We can't have a society comprised solely of rocket scientists and brain surgeons; there's a lot of other shit that needs to get done.
And finally, how would you even go about policing such a program? Obviously we're just discussing a hypothetical, but the transition to implementing such a plan proved too difficult for the totalitarian regime of the Nazis; what chance do we have? We'd have to completely restructure society to strip away any semblance of freedom; if two people managed to get out on their own, they could produce a baby completely unbeknownst to our government, and any such offspring would inherently weaken the strength of our superman program by diluting the gene pool with inferior genetic material. We'd essentially have to turn our society into a Matrix-like colony of government studs and broodmares with desirable traits. Or we could just kill off all the undesirables. Regardless, the implementation of such a policy would destroy every single facet of our society; is it worth it in the pursuit of the perfect human?
From a moral standpoint, eugenics is completely indefensible. But even when you set morality aside, eugenics is completely illogical. It's just not a good idea in any way, shape or form.