There is really nothing "liberal" about liberal eugenics. It is a philosophy that was, and will always be, used to produce someone's idea of the ideal human being. The Nazis used a form of liberal eugenics to justify the removal of certain hereditary traits from being passed onto the next generation. Even in modern times we have seen the attempted eradication of certain ethnic groups. Darfur is a good example. This has been achieved through mass sterilization and/or genocide. While advocates claim that there is a difference between the positive and negative liberal eugenics, I see no good coming from any form and it is a dangerous tool in the hands of autocratic states.