It can work the other way, too

Tiny helicopter dick in cubical at work

The main flaw with the story is that the possibility of genetically breeding for stupidity is unproven. Not to mention financial analysts. And that's too much of a limitation on the format. Disavowing the exploitation that has so often riddled human history, the Federation decides to keep its hands off of any societies that have not yet attained interstellar travel. Built in space, it was never intended to land.

There were fewer of them these

But that was done in the name of the peace. If present trends continue, genes for imperfect eyesight will be ruthlessly bred out until no human wears eyeglasses.

There were fewer of them these days. They are more or less at war with the status quo group.

Whatever problems the future might bring, time did not yet hang heavy on humanity's hands. Finally there is all those hideous overtones of Nazi Germany. Ionizing radiation causes mutation in genes, which would provide a source of new genetic variations.

Mostly what were left were technicians, cookbook engineers who might make a minor change in a recipe if they were very daring. The Okies earn their living by being hired by the colonists. He pried one eye open, then the other. The easy answer is the nuclear bomb.

But around more and moreNow they were taking awayBut they were

And this group, either by ignorant chance or with deliberate purpose, turned certain installations in the station into weapons for an attack upon Terra. Being a New Man does not divorce you from human sympathies and pleasures. Indeed, many oil-rich autocratic countries just allow other countries to come in and drill it, keeping local labor entirely out of the loop. He may still plant his corn in the dark of the Moon but he will plant better corn developed by better men than he.

Other novels mention dark rumors

But around more and more economists became alarmed that this time it was different. Now they were taking away jobs by replacing human intellect. But they were still stuck on that goal oriented evolution nonsense. Other novels mention dark rumors about how mutant occur on those planets beyond the rim of the galactic empire.