Just thought I'd mention as well, our own personal ways of selecting a mate are a form of eugenics. Personality has a large part to play. But we are attracted to physical traits in a partner, some of it unconsciously. And that has a strong genetic basis. Women are attracted to different men at different times of their cycle - stronger jaws when ovulating and more round when not. Both women and men find that people who are genetically similar to themselves smell unattractive, and smell is a way of detecting genetic markers that will produce offspring with particular immunities. We are naturally attracted to symmetry of the body and face, to healthy skin and hair, to people who are easy-going and who demonstrate physical prowess. Some things are overridden by emotional compatibility, but these natural, instinctive markers are all undeniable. Interestingly enough, some traits differ from culture to culture. And a large majority of the traits we find attractive are signs of genetic health and compatability. All that selective breeding does, is that on top of the things we already do naturally, we can use the perspective of current science and technologies to enhance our instinct to have healthy offspring. Racism, classism, sexism, etc. are things that have given selective breeding a bad name. None of those things are logical ways to have an impact on the health of the human species. The scope is much more grand, and somehow more simple than people think at the same time. What people fear is illogical discrimination, and that's what needs to be avoided.