Eugenics is scientifically valid & verifiable. The problem with it isn’t in the science. It runs into trouble, in the realm of politics. What science says about eugenics is true; the rejection of it is not a good example of Science As Self-Correcting.
Science is penalized on the topic of eugenics, because it was an avoidable social (political) misstep. It was avoidable firstly because more than 2,000 years ago the famous ancient Greek, Plato, explained and spelled out in writing that eugenics would be unacceptable to the public, and could only be pursued in secret.
It’s no secret that free-access to and government-tax-paid abortion is applied far more to minorities. There are those who point out that the poor, the unprepared, those who don’t or can’t practice self-control, and those with browner skin are preferentially reproductively suppressed, thanks to freely-provided abortion … and that this amounts to defacto eugenics.
During the half-century during which eugenic ideas & practices were under active discussion & investigation, a number of otherwise attractive individuals became involved, and are today thereby soiled.