In reality, no one has rights outside of the dominant governing regime. That statement by itself is a complete repudiation of the concept of natural rights, which would argue exactly the opposite. But it's true. The notion of "natural rights" attempts to create a universal principle where none exists. In fact, if you put stock in some of the more speculative ideas in physics (e.g. bubble universes in inflationary cosmology), even the universe doesn't obey those sorts of universal principles and in fact does have different rules ("particle rights") in different regions ("nations"?). So perhaps the analogy is better than I'm giving it credit for...
I think, oddly enough, the best way to start this is to reject--out of hand--the idea that 'natural rights' cannot possibly be static constructs. Why? For the simple reason that we cannot violate fundamentals about the human mind. Namely, that certain concepts (if not, necessarily, natural rights) are developed
a priori and perfectly.
[As an aside, it's ironic to note how we have both developed; to the point where empiricism is used as an attempt to disprove Natural Rights; while rationalism is used to support them. Funny, no?]
To use examples from the world's reigning philosophical influence, Kant, the mind is not the blank paper or empty cupboard of the empiricists, waiting to be filled in by experience. The mind comes furnished with a set of pure a priori concepts, Categories, which organize incoming sensory information. The mind actively interprets the incoming information and imposes meaning on the material of experience. This of course, has been acknowledged as having a physiological basis. Noam Chomsky's Language Acquisition Device (LAD) or the work done by the popular author Steven Pinker both prove that the human mind is innately blessed with some sort of intuition (not to mention, unknown influences that society has no control). It follows that if humans can infer the meaning derived from words that they should never have known, then experience does not determine the structure of the mind. This allows for universality. Propositions become necessary and valid because of the way the mind functions.
If that one point is acknowledged, the whole argument presented in this thread against Natural Rights ceases to be internally consistent. If universality exists, and if innateness 'exists,' there is obviously the third tenant: reasonable explanation (that, I believe, we all have at least glanced over) for why Natural Rights can be described as part of this innateness and universality if those two adjectives really do exist. At which point, the whole argument that Natural Rights have physiological and philosophical basis that can't be contradicted by political entities is close too settled. If Natural Rights are thought to be a universal aspect inherent to human beings, it really doesn't matter what a government does. If, for instance, a government declared that no one will speak any bit of coherent language for their entire lives; no one would say that the PAD was eliminated from the human psyche. Similarly, Natural Rights exist no matter what variances occur.
Admittedly, there is no such thing as a completely 'self-regarding.' Yet, there is a difference--one you either ignore or don't realize--between individuals voluntarily accepting the role of society and them being dependent on society for their natural rights.
John Mill said:
The distinction between the loss of consideration which a person may rightly incur by defect of prudence or of personal dignity, and of others, is not a merely nominal distinction. It makes a vast difference both in our feelings and in our conduct...
Of course, the argument against having Natural Rights mean nothing unless within the greater context of society is, quite simply, society is stupid. People are stupid. When the public opinion and individual rights entangle, it is almost wholly the public which interferes wrongly; at the misappropriate place, time and belief. I need not to go into examples now, we all know too many, but one that springs to mind is the recent Proposition 8 battle, the Mosque near the former location of the WTC, and Muslim architecture in Switzerland.