Libertarian Free Will

Epicurus, working within an atomist physics inherited from Democritus that was otherwise strictly deterministic, introduced a controversial modification: atoms, in addition to falling through the void, occasionally swerve from their determined path in a small, unpredictable way, and it is this clinamen, this swerve, that Epicurus and his Roman successor Lucretius argued makes room for genuine agency, since without some break in the chain of necessity, human choice would be no more free than a stone's fall. The proposal was widely mocked even in antiquity for seeming to explain freedom by appeal to sheer randomness, which critics pointed out is not obviously any better than strict determinism from the standpoint of responsibility, since an action caused by a random swerve seems no more genuinely up to the agent than one fully determined by prior causes.

Contemporary libertarians such as Robert Kane have tried to answer this randomness objection directly, arguing that indeterminacy need not be mere randomness if it occurs specifically at moments of significant, effortful deliberation, where an agent is genuinely torn between competing reasons, so that the resulting choice, while not determined, is still intelligibly the agent's own rather than a matter of chance imposed on them from outside.

Libertarian free will is the position nearly every tradition's account of sin, merit, and moral accountability quietly assumes, since praising or condemning a choice seems to require that the person could genuinely have chosen otherwise, not merely that they did what prior causes, divine or physical, always guaranteed they would do; this is exactly why theological determinism, whether Calvinist predestination or a strict reading of divine foreknowledge, has generated centuries of internal religious controversy over whether it can be squared with genuine human responsibility at all.

Compatibilists argue the whole worry is misplaced, since freedom worth wanting never required this strong, causally uncaused kind of choice in the first place, only the absence of external coercion; libertarians reply that compatibilist freedom is freedom in name only, a watered-down substitute for what moral responsibility actually requires. The position's own hardest problem remains locating a coherent, non-random source for an undetermined choice, since an event with no sufficient cause at all looks, to determinist critics, indistinguishable from mere chance, however much libertarians insist that a reasons-responsive agent choosing among live options is something other than a coin flip.