The follow up point Eric is that YES, it is through the anticipations of the people involved that they will reach their decisions as to what is just and what is unjust and they will work as hard as they can to implement those ideas.
BUT at the same time they must realize that the answer they reach to their questions is determined by a combination of their own circumstances plus the developed dispositions they bring to the table, and that there is no God, or Ten Commandments, or any other "supernatural" or "eternal" or even "Nature's Own Single Answer" justification for their decisions