Who's to define a gene pool's "efficiency"? What even constitutes "efficient"? Are you completely unaware that a person's environment and socialization play a far greater role in their outcome? If you care about improving society, then focus on reducing abuse and neglect of children, providing them a world class education, keep them out of poverty, and teach tolerance and empathy for all living things.
Eugenics is rightfully treated with extreme skepticism and disdain. It's the refuge of those who think of humans in terms of some genetic hierarchy; this is damnable as it too often leads to racism, ableism, classism, and a total lack of empathy towards their fellow man. No matter how you try to dress it up in benevolent terms, it's a sick view.
