Utilitarians hold that individual wants cannot be rationally justified; they are intrinsically worthy subjective valuations and cannot be judged instrumentally. This belief supports philosophers who hold that facts ("what is") can serve as instrumental means for achieving ends, but cannot authorize ends ("what ought to be"). This fact-value distinction creates what philosophers label the "is-ought problem": wants are intrinsically fact-free, good in themselves; whereas efficient tools are valuation-free, usable for good or bad ends. In modern North-American culture, this utilitarian belief supports the libertarian assertion that every individual's intrinsic right to satisfy wants makes it illegitimate for anyone—but especially governments—to tell people what they ought to do.