Unpopular opinion but eugenics definitely has the potential to create a "better" population. The problem is its highly highly unethical in any deliberate implementation and is typically orchestrated by tyrannical dictators who's ego and ideologies supersede the science needed to make it effective. I mean look at the nazis - they had some stupid ass theories that allowed them to claim they were a superior race.

But yeah if this weren't the case then you'd have to explain away genetic engineering of livestock and crops over the millenia. That said - no one should be orchestrating that shit.