My intention in this paper is to outline and criticise some of the main ideas in Michael Dummett’s classic article “Bringing about the Past”. From Dummett’s remarks we can reconstruct two sceptical arguments designed to show that it can never be rational to attempt to bring about past events. Dummett is critical of both arguments. Though happy with Dummett’s reply to the first sceptical argument, I disagree with his reply to the second.

In this paper, I consider a variant of the ancient Idle Argument involving so‐called “unconditionals” with interrogative antecedents. This new Idle Argument provides an ideal setting for probing the logic of these close relatives of if‐conditionals, which has been comparatively underexplored. In the course of refuting the argument, I argue that contrary to received wisdom, many unconditionals do not entail their main clauses, yet modus ponens is still unrestrictedly valid for this class of expressions. I make these lessons precise in (...) a formal system drawing on recent work in inquisitive semantics. My larger aim is to challenge standard truth preservation accounts of logic and deductive argumentation. (shrink)