A common theme in defending speciesism is the argument that humans have the right to exploit other species to defend their own. Philosopher Carl Cohen stated in 1986: "Speciesism is not merely plausible; it is essential for right conduct, because those who will not make the morally relevant distinctions among species are almost certain, in consequence, to misapprehend their true obligations." Cohen writes that racism and sexism are wrong because there are no relevant differences between the sexes or races. Between people and animals, he states, there are significant differences; his view is that animals do not qualify for Kantian personhood, and as such have no rights.