metaphysical libertarianism

metaphysical libertarianism
Name	Metaphysical libertarianism
School	Metaphysics, Philosophy of mind, Ethics
Region	Western philosophy
Influenced	Robert Kane, Thomas Reid, William James, Alfred Mele, Peter van Inwagen

metaphysical libertarianism is a position within the philosophy of free will asserting that free will is incompatible with determinism and that human beings do, in fact, possess such libertarian free will. It posits that for an action to be truly free, the agent must have the ability to do otherwise under exactly the same antecedent conditions, a capacity that requires the falsity of causal determinism. This view is central to debates in metoral responsibility, theology, and the interpretation of quantum mechanics.

Definition and core principles

Metaphysical libertarianism is defined by its commitment to incompatibilism and its positive assertion of indeterminism in the human decision-making process. Its core principle is the Principle of Alternative Possibilities, often associated with the Frankfurt cases proposed by Harry Frankfurt. Proponents argue that genuine moral responsibility requires that an agent be the ultimate originator, or prime mover, of their actions, a concept sometimes called agent causation as discussed by Roderick Chisholm. This contrasts sharply with event causation models found in David Hume or Baruch Spinoza. The position often involves a rejection of physicalism in favor of forms of substance dualism or non-reductive physicalism to accommodate a non-deterministic causal power.

Historical development

Early forms of libertarian thought can be traced to Epicurus and his modifications to the atomism of Democritus to introduce an element of swerve. In medieval philosophy, Augustine of Hippo grappled with similar issues in the context of divine foreknowledge and sin, while Thomas Aquinas synthesized Aristotelian thought with Christian theology. The modern era saw robust defenses from Thomas Reid of the Scottish School of Common Sense and later from Immanuel Kant, who posited a noumenal self existing outside deterministic natural laws. In the 20th century, the development of quantum mechanics by figures like Werner Heisenberg provided a new scientific context for indeterministic arguments, influencing philosophers such as Arthur Holly Compton.

Arguments for metaphysical libertarianism

A primary argument is the intuition of freedom, the pervasive experience of deliberation and choice cited by William James in his lectures on pragmatism. The moral argument, advanced by Immanuel Kant in his Critique of Practical Reason, holds that moral obligation presupposes a free will. The consequence argument, formally developed by Peter van Inwagen, uses modal logic to contend that if determinism is true, no one has power over the facts of the past and the laws of nature, and thus no power over their consequences. Some proponents, like Robert Kane, advocate for event-causal libertarianism centered on efforts of will in self-forming actions that occur at moments of inner conflict.

Criticisms and objections

The most persistent criticism is the intelligibility objection or problem of luck, which charges that undetermined actions appear random and thus cannot be attributed to an agent for reasons, a challenge raised by Galen Strawson in his Basic Argument. The mind-body problem presents difficulties for how a non-physical will could interact with the brain, a classic issue for René Descartes. Compatibilists like Daniel Dennett in Elbow Room and Harry Frankfurt argue that alternative possibilities are not necessary for responsibility. Furthermore, the empirical evidence from neuroscience, such as the experiments of Benjamin Libet, is often cited to challenge the conscious will.

Relation to other philosophical positions

Metaphysical libertarianism is directly opposed to hard determinism, exemplified by Baron d'Holbach in The System of Nature, and to compatibilism or soft determinism as defended by Thomas Hobbes in Leviathan and David Hume in A Treatise of Human Nature. It is distinct from, but often conflated with, political libertarianism associated with John Locke or Robert Nozick. Within theology, it aligns with Molinism and Arminianism against theological determinism and Calvinism. It shares a commitment to indeterminism with some interpretations of the Copenhagen interpretation of quantum mechanics.

Notable proponents

Significant historical defenders include Thomas Reid, who wrote extensively in his Essays on the Active Powers of Man, and William James in his essay The Dilemma of Determinism. In contemporary philosophy, Robert Kane of the University of Texas at Austin is a leading figure, authoring The Significance of Free Will. Other modern proponents include Timothy O'Connor at Indiana University Bloomington, Laura Ekstrom at the College of William & Mary, and E.J. Lowe of Durham University. The theologian Alvin Plantinga has also defended a form of libertarianism in the context of the problem of evil.

Category:Free will Category:Metaphysical theories Category:Philosophical concepts