Mackie's argument from queerness

J.L. Mackie's argument from queerness challenges the existence of objective moral values. He reasons that if such values existed, they would be profoundly strange—either as supernatural entities or as something inherently peculiar—requiring us to accept their unusual, almost supernatural, nature. This “queerness” makes moral facts seem less plausible because they would demand a kind of extraordinary existence that doesn’t match our common understanding of reality. So, the argument suggests that the strange, inexplicable nature of moral values leads us to doubt they are objectively real.