Argument from queerness The most prominent argument for nihilism is the
argument from queerness.
J. L. Mackie argues that there are no
objective ethical values, by arguing that they would be queer (strange):If there were objective values, then they would be entities or qualities or relations of a very strange sort, utterly different from anything else in the universe. For all those who also find such entities queer (
prima facie implausible), there is reason to doubt the existence of objective values. In his book
Morality without Foundations: A Defense of Ethical Contextualism (1999), Mark Timmons provides a reconstruction of Mackie's views in the form of the two related
arguments. These are based on the rejection of properties, facts, and relationships that do not fit within the worldview of
philosophical naturalism, the idea "that everything—including any particular events, facts, properties, and so on—is part of the natural physical world that science investigates" (1999, p. 12). Timmons adds, "The undeniable attraction of this outlook in
contemporary philosophy no doubt stems from the rise of modern science and the belief that science is our best avenue for discovering the nature of reality". There are several ways in which moral properties are supposedly queer: • our ordinary moral discourse purports to refer to intrinsically prescriptive properties and facts "that would somehow motivate us or provide us with reasons for action independent of our desires and aversions"—but such properties and facts do not comport with philosophical naturalism. • given that objective moral properties supposedly
supervene upon natural properties (such as biological or psychological properties), the relation between the moral properties and the natural properties is metaphysically mysterious and does not comport with philosophical naturalism. • a moral realist who countenances the existence of metaphysically queer properties, facts, and relations must also posit some special faculty by which we have knowledge of them.
Responses and criticisms Christine Korsgaard responds to Mackie by saying: Other criticisms of the argument include noting that the very fact that such entities would have to be something fundamentally different from what we normally experience, therefore assumably outside our sphere of experience, we cannot
prima facie have reason to either doubt or affirm their existence. Therefore if one had independent grounds for supposing such things to exist (such as a
reductio ad absurdum of the contrary) the argument from queerness cannot give one any particular reason to think otherwise. An argument along these lines has been provided by, e.g.,
Akeel Bilgrami. Ian and Myles king argue that quantum phenomena have been shown to share several of the unusual characteristics of ethical entities. The
observer effect,
quantum entanglement, the
wave-particle duality of
light, and other phenomena appear to share properties with aspects of ethics.
Argument from explanatory impotence Gilbert Harman argued that we do not need to posit the existence of objective values in order to explain our "moral observations". ==See also==