agencytheory aspectmoral claims consequentialism contractarianism davidalm davidrodin droitsdel'homme(droitinternational) duties ethics exclusionaryreasons exercise-basedrights goods humanrights jamesgriffin josephraz moralandethicalaspects moralphilosophy obligations philosophy philosophyoflaw politicalphilosophy relationality rightloss rightstheory services thomasnagel valuetheory warrenquinn