The ideal worlds objection

Abstract The Ideal Worlds objection is an objection that purports to identify a potentially fatal flaw in some of our most influential moral theories: including, among others, rule consequentialism, Kant's Law of Nature Formula of the Categorical Imperative and Scanlonian contractualism. In this article, I offer an account of the objection, a survey of some of the ways defenders of affected theories have sought to avoid it, and the problems that those responses can encounter.