I agree ethics can be subjective, so much so that there is more than one model of ethics.
However, please tell me which model of ethics supports eugenics. Is it Utilitarian, Rights, Fairness, Common Good, or Virtue?
Since it's subjective, you can just make up your own model supporting eugenics, and it'll be just as valid as any other model.
Since it's subjective, you can just make up your own model supporting eugenics, and it'll be just as valid as any other model.