Strictly speaking that would be a yes. Somewhere along the lines we evolved to the point of having enough intelligence to figure out selective breeding, even before Darwin put labels to it all we were practicing forms of selective breeding with livestock and even ourselves (Sparta and others). The problem comes in at scale, both in width and length. Spartan breeding habits wouldn’t really work across the bredth of humanity, they weren’t that good at breeding anything but fighters. And of course for the problems inherent with long term selective breeding just look at what’s been happening to purebred dogs the last couple of decades, and if I wanted to I could throw in a dig on the British royal family here too but I won’t ;) So we really do have to consider whether or not we’ve really developed the ability to perform eugenics yet, I don’t think we’re there yet when it comes to dealing with non-humans and I’m not sure we’ll ever develop the ability with humans. Which is probably a good thing, life is more interesting with imperfect people.
Lets be a little more precise. We both know we have the ability. You are addressing our level of competance.
But why should a lack of competance mean we should avoid exploiting this ability? Maybe we will all die if we don't. But maybe we will all die if we do. As you said we don't have the ability yet to decide which traits are good and which are bad.