The term "negative utilitarianism" was introduced by R. Ninian Smart in 1958 in his reply to Karl Popper's The Open Society and Its Enemies. Smart also presented the most famous argument against negative utilitarianism:[7] that negative utilitarianism would entail that a ruler who is able to instantly and painlessly destroy the human race would have a duty to do so. Furthermore, every human being would have a moral responsibility to commit suicide, thereby preventing future suffering.[8] Many authors have endorsed versions of this argument.