I get the impression that this "natural right" term is intended to preclude inquiry and shut down discussion.
It seems that the only effect this "natural right" term has on sufficiently curious interlocutors (who will not fall for your rhetorical trick) is to signal that you are more stubborn than people who do not use the term.
Any involuntary contract imposed on any individual is axiomatically immoral and unethical, as I've said below. There's no need to use such extreme examples.