You should have a reason for that. Just feeling terrible might mean you're inside an echo chamber.

Most people support eugenics in the form of outlawing incest because it can lead to faulty offspring. We also think treating neurodegenerative diseases is a good thing. Most parents also hope their kids will be smart. Or at least they don't hope for the opposite. Women don't like to have kids past 40 partly because of higher risk of Down's syndrome. And there's a test for that which can help them decide to abort the baby. All these things are us trying to make future humans smarter, mostly by eugenic techniques.

Maybe you're thinking of actually killing people? That's not quite the same as selective breeding.