In the course of an absolutely stunning deconstruction of Ayn Rand libertarianism, the Nation strikes a bone-deep blow to the corpus of several schools of ethics, not least utilitarianism, that contend that logic and reason are adequate paths to a functioning moral code. (Emphasis mine)
Rand also liked to cite Aristotle’s law of identity or noncontradiction—the notion that everything is identical to itself, captured by the shorthand “A is A”—as the basis of her defense of selfishness, the free market and the limited state. That particular transport sent Rand’s admirers into rapture and drove her critics, even the friendliest, to distraction. Several months before his death in 2002, Harvard philosopher Robert Nozick, the most analytically sophisticated of twentieth-century libertarians, said that “the use that’s made by people in the Randian tradition of this principle of logic…is completely unjustified so far as I can see; it’s illegitimate.” In 1961 Sidney Hook wrote in the New York Times,
Since his baptism in medieval times, Aristotle has served many strange purposes. None have been odder than this sacramental alliance, so to speak, of Aristotle with Adam Smith. The extraordinary virtues Miss Rand finds in the law that A is A suggests that she is unaware that logical principles by themselves can test only consistency. They cannot establish truth…. Swearing fidelity to Aristotle, Miss Rand claims to deduce not only matters of fact from logic but, with as little warrant, ethical rules and economic truths as well. As she understands them, the laws of logic license her in proclaiming that “existence exists,” which is very much like saying that the law of gravitation is heavy and the formula of sugar sweet.
It goes without saying that this is also a gutting indictment of Objectivism.