The Unseen Chains: How Determinism's Specificity Undermines Libertarian Free Will — Epoche C1
The Terms of the Debate The free will debate turns on a thesis that must be stated exactly, because everything else depends on its precision. Determinism is the claim that the complete state of the world at any one moment, together with the laws of nature, fixes exactly one possible future — not a range of likely futures, but a single one, down to the last neural firing. Peter van Inwagen's formulation in An Essay on Free Will (1983) is standard: a proposition describing the entire world at some instant in the remote past, conjoined with the laws, entails every truth about what happens afterwards, including every truth about what you and I do. The positions in the debate are then defined by two questions. Is free will compatible with determinism? Compatibilists say yes; incompatibilists say no. And do we in fact have free will? A libertarian (in the metaphysical, not the political, sense) answers the first question no and the second yes: free will exists, therefore determinism is false, at least at the junctures where free choices occur. The libertarian's motivation is usually the intuition enshrined in what Harry Frankfurt (1969) named the Principle of Alternative Possibilities: a person is morally responsible for what she has done only if she could have done otherwise. Add van Inwagen's celebrated consequence argument — if determinism is true, our acts are consequences of the laws of nature and of events before our birth; neither the laws nor the remote past is up to us; and what follows necessarily from things not up to us is itself not up to us — and the libertarian package looks forced: responsibility requires alternatives, determinism forecloses them, so a responsible agent must be an undetermined one. This perspective is exemplified by Robert Kane, whose The Significance of Free Will (1996) is the most developed contemporary libertarian theory. Kane posits that our capacity for self-forming actions (SFAs) requires a freedom incompatible with a world where all events, including our choices, are causally predetermined. This critical review argues that common forms of libertarianism, Kane's included, overlook crucial phenomenological insights — insights available to careful first-person description of experience, which is what "phenomenology" means here — into the specificity of deterministic causation. Determinism is not a vague fog of influence; it is a claim about exact outcomes from exact conditions. Once that granularity is taken seriously, the space in which libertarian freedom is supposed to operate becomes very hard to locate. Kane's Self-Forming Actions Because the argument below targets Kane, his view deserves a fair statement. Kane accepts that most of our actions flow deterministically from our already-formed character, and he is content for them to do so — they can still be free in a derivative sense, provided the character they flow from was itself shaped by earlier undetermined choices. Those earlier choices are the SFAs: rare, effortful decisions taken in moments of genuine inner conflict, where the agent's own will is divided. His recurring example is a businesswoman hurrying to a career-defining meeting who witnesses an assault in an alley: ambition pulls one way, conscience the other. Kane's proposal is that in such moments the agent makes parallel efforts of will toward each option, that the neural processes realising these efforts are genuinely indeterminate — no prior state of the world fixes which effort will succeed — and that whichever choice results, the agent is responsible for it, because she was actively striving for that very outcome when it occurred. Crucially, Kane does not claim SFAs are uncaused : they are caused by the agent's reasons and efforts, but caused indeterministically , the way an unstable atom's decay is caused by its physical constitution without being fixed in its timing. The original version of this essay described libertarians as seeking "a sphere of genuinely uncaused choice"; that was too strong for event-causal libertarians like Kane, and the correction matters, because the argument against him must engage the view he actually holds. The Cat, the Mice, and Causal Specificity Consider the wisdom encapsulated in the Akan proverb, "When the cat is not at home, the mice dance." This simple observation speaks to a fundamental understanding of causation: the absence of a specific causal agent (the cat) directly facilitates a particular outcome (the mice dancing). The proverb registers something metaphysicians formalise as causation by absence — an omission or lack can be as causally decisive as a presence. In a deterministic framework, every "dance" is not merely influenced but necessitated by the precise configuration of presences and absences among the prior conditions. Change one whisker of the setup and, by the definition of determinism given above, the guaranteed outcome may change; keep the setup fixed and exactly one outcome is possible. Libertarian accounts, while acknowledging the existence of causal chains, often treat determinism as a general constraint — a background pressure that freedom must somehow push against — rather than what it is: a specific, granular force that assigns to every total condition exactly one sequel. This leads to several critical deficiencies. The Phenomenological Specificity of Deterministic Causation The 'Why This, Not That?' Conundrum: Determinism dictates not just that an event will occur, but precisely which event will occur given the antecedent conditions. If I choose coffee over tea, a deterministic universe implies that the specific neural firings and psychological states leading to the coffee choice were necessitated. The libertarian must therefore say that in the exact same total antecedent conditions — same brain state, same reasons, same effort — a different choice could genuinely have emerged. But now a question with real teeth arises, one the literature calls the luck objection . Van Inwa