I agree to an extent, but as a lawyer you know the natural law and natural rights are divinely inspired. It is decreed that our natural rights come from our humanity, they are gifts from God and nature. It doesn't matter if you are religous or secular, but we should be able to make both arguments.
Also, the natural law is embodied in the Constitution and Declaration. I believe this is the essence of western civiliazation, the natural law.
Butler Shaffer is a law professor at a California University. He's quite smart, he understands this and he writes about it.
And most importantly, without natural rights, as free society we are finished. Without natural law and natural rights, there is no freedom. Perhaps that's why we are failing so badly.