Speciesism is morally objectionable because, like racism, sexism, and heterosexism, it links personhood with an irrelevant criterion. Those who reject speciesism are committed to rejecting racism, sexism, heterosexism, and other forms of discrimination as well.
Gary L. FrancioneIt's really not rocket science. If animals are not mere things; if they have moral value, we cannot justify eating, wearing, or using them particularly when we have no better reason than palate pleasure or fashion. If you are eating, wearing, or using animals, then your actions say that you regard them as mere things, despite what your words say.
Gary L. Francione