Natural rights are possible, despite nonenforcement. Moral properties and relations pertain to individuals and individuals only. No moral judgment is meaningful unless it is equivalent to a proposition about individuals. 8 Duty is a relation. The only duties that exist hold between individuals or an individual and himself or herself.
Rights are relations.
The only rights that exist are rights that individuals hold against individuals, possibly against themselves. If there is no individual against whom a putative right is held, there is no right. Privileges don't entail claims. Possibly, x has a duty not to do z and a claim right against all y that x be allowed to do z. There may be a right to do wrong.