Yeah, look at pugs and tell me humans are capable of the kind of careful long term deliberation needed to decide the genetic future of a species.

And even that framing has too narrow a scope. Can't separate you from your microbiome, can't separate an organism from it's ecology. If you could somehow have a eugenics project free from prejudice (fat fucking chance), you run into the problem that a eugenics program would be an unrealistically complex and long term undertaking, prone to terrible mistakes even from the most well meaning practitioner.