Political action needs a degree of freedom, to change and to adapt, to determine collective priorities and to weigh interests in a function of political preferences as expressed in elections. More and more areas are seized by the concept of human rights. Some Catholic thinkers would argue that from an anthropological point of view, many human rights are inscribed in human nature, hence come from God and should be respected for this reason. I certainly do not deny that reference, quite the contrary. Any system in society, including the legal system, is legitimate only to the extent it does not contradict natural law.
Natural law provides the ultimate foundation for a just and legitimate order.
It is precisely because the link between the legal system and a just and legitimate order becomes weaker and weaker, that the legal system, and for that matter also the political system, are losing their legitimacy. The benchmarks of natural law must be respected by all lawmakers, whether they are legislators or judges. However, natural law as such is not part of positive law, and should not be made part of it. Another reason for resisting the proliferation of rights is that they can be interpreted differently in the future. So in order to bring the two in harmony, your definition has to be changed.