To impose a single system is pure totalitarian hegemony. It goes wholly against ethical diversity. Any attempt to impose a single ethical system is just a political ploy to gain another type of societal control. It will not work. Teach a simple ethical concept.
Ethics is evolution.
Ethics are local. A good example here is to consider what Alpha Centaurians and Betelgeusians would think about UK's Molly. By that we mean that all local cultures should cooperate among themselves when possible, and they should defend themselves when necessary. To take this survey yourself go to AAAS' Nextwave site.