I guess the problem comes when that morality is subjective. Science doesn't care about your beliefs; and if morals and ethics are relative and personal, then he really has no grounds to say that his 'right and wrong' are more right than a Nazi's 'right and wrong'.
Partner selection is already selective breeding anyway; just decentralised.
You'll never get a better result by centralising decision making away from the coal face; so I think eugenics in practice would fall flat.
Good points Matt. The discussion on morality is another complex subject altogether, but I have to agree. Saying morality is subjective, makes the right and wrong nuance too blurry for those who are conflicted.