Libertarians believe that there is, fundamentally, only one right: the right not to be aggressed against. All further rights are simply applications of, rather than supplements to, this basic right. Hence the vast panoply of other rights – positive rights, welfare rights – recognized by existing political regimes is dismissed as illegitimate.
This view seems mysterious to non-libertarians. More specifically, the libertarian position strikes many critics as puzzlingly one-sided. Freedom from aggression is a good thing, certainly; but so are freedom from hunger, freedom from disease, and freedom from poverty. Why not recognize rights in all these cases? What sort of lopsided view would one have to have of human life, in order to think that aggression is, but hunger, disease, and poverty are not, serious enough evils to take into account in devising a system of rights?"