Can any system of justice properly function devoid of morality?

Our courts consider only the legalities of their judgements. Morality has no place in them. If it is true that morality cannot be legislated and the courts opinions are the simple interpretation of existing law, how then do we preserve morality? Are we, as a nation, better off amoral? Can we have "rights" divorced from "responsibilities" ? I think they are opposite sides of the same coin. What do you think?