  Moral skeptics can then argue that the definition of moral nihilism forestalls any refutation. Since moral nihilists question all of our beliefs in moral wrongness, they leave us with no starting points on which to base arguments against them without begging the question at issue. Moreover, moral nihilists’ explanations of our moral beliefs predict that we would hold exactly these moral beliefs, so the truth of its predictions can hardly refute moral nihilism. If this trick works, then it fits right into a skeptical hypothesis argument.