The notion that we suck at choosing the good genes is entirely misled, even if it is just sarcasm.
If we didn't, we'd be talking about eugenics as that nasty unethical thing we tried once upon a time that eliminated say Huntington's disease from a population, but we decided wasn't worth it because of the ethical issues in actually doing it, rather than as just "racism in a lab coat". The fact that eugenics in practice was about race at all is an example of us being bad at choosing "good genes."
The final question is also morally misled because science and the notion of truth is not amoral. Science, without humans, doesn’t exist. And humans are moral beings (constrained by social and moral considerations).
Reality exists, and continues to regardless of whatever moral framework you subscribe to. Moral frameworks are specific to time and culture, what is acceptable politically even moreso. There are and will always be things that are real and are true and perhaps even useful to know or launching points for further understanding that are outside the range of current acceptable social, moral or political considerations, but that doesn't make them less real.
Truth is not limited to the Overton window.