Abstract: This article responds to current critiques directed against Hoppe’s justification by performative contradiction of the self-ownership axiom. Maintaining that ethics should be grounded on sound principles, Hoppe observes that only self-ownership can pass the test of performative contradiction. From this idea, he concludes that only libertarianism (the ethical system grounded on the axiom of self-ownership) can be justified. Any other ethic is self-defeating. An important debate in ethics was stimulated by numerous critiques formulated against the performative contradiction and more precisely against the use that Hoppe makes of it in justifying libertarianism. Without endorsing Hoppe’s argumentation, this article prevents some common misunderstandings, systemizes the types of critiques and thoroughly replies to them.