Those who believe in State power don't care that it is ineffective or even counterproductive. State power is an end in and of itself that they desire, despite the total lack of any success in central planning over the benign self interest of millions of individuals in a Free Market.
My point is the society that uses eugenics to produce what it thinks is a “superior” human being - will be overcome, conquered, and disposed of by us regular humans - who are more independent adaptable violent and unpredictable; and thus in the “market” of human interaction - actually superior.
Like releasing a prized race horse population into an area where there is a wild horse population. On the racetrack the racehorse might well be “superior”. In the rough and tumble world of the open plains - the wild horses are going to eat the race horses’ grass, take the race horses’ mares, and show no respect to the race horses’ foals.
Eugenics (i.e. selective breeding) of horses didn't produce a “superior” horse - just a faster one (racehorse), a stronger one (draft horse), and a more aggressive one (war horses). None of the above would be able to successfully compete with a wild horse in the wild.