Chance, Choice, and Control: Free Will in an Indeterministic Universe

While the free will debate tends to focus primarily on the implications of determinism for freedom, a long line of philosophers have also argued that free will would not be compatible with indeterminism either. These arguments typically take the form of a so-called Luck Objection: a family of related arguments which all seek to show, roughly, that if an action is not causally pre-determined then it must be a sort of random happening, over which the agent lacks the control required for free will. If successful, these arguments are fatal for libertarian accounts of free will, which are committed to the view that free actions must be both undetermined and under the agent’s control. In this paper, we defend libertarian free will against this challenge from luck. We argue that most formulations of the Luck Objection presuppose a conceptual model of indeterministic decision-making that is not well aligned with recent advances in the natural sciences; specifically, we argue that they make assumptions about the nature of indeterminacy and about the causal structure of decision-making, which libertarians have good empirical reason (from both physics and neuroscience) to reject. We develop a more empirically plausible model of agential decision-making and apply this to the problem of luck. We argue that, under such a model, it is entirely natural to think of an agent’s actions as both ‘undetermined’ (in the sense of being under-determined) and under their own control. We conclude that indeterminism poses no threat to a more naturalistic version of libertarian free will.