Murray N. Rothbard e a ligação entre ética e utilitarismo

"What, then is the proper relationship of praxeology to values or ethics? Like other sciences, praxeology provides laws about reality, laws that those who frame ethical judgments disregard only at their peril. In brief, the citizen, or the "ethicist," may have framed, in ways which we cannot deal with here, general ethical rules or goals. But in order to decide how to arrive at such goals, he must employ all the relevant conclusions of the various sciences, all of which are in themselves value-free."