This however is nonsense:
"Since rights and the resulting duties follow naturally from human interaction, it is easy to forget that they are the fruit of a commonly held sense of justice built primarily upon solidarity among the members of society, and hence valid at all times and for all peoples."
Not all peoples are members of the same society. Different societies each have a different sense of justice.
I'm surprised he made such an obvious misstatement -- it represents dangerous wishful thinking on a grand scale.