Hard Determinism and Free Will: Key Philosophical Arguments

Metaphysical libertarianism argues that free will exists by challenging the determinist view that our sense of freedom is merely an illusion; Campbell contends that determinists 'beg the question' by assuming a mechanistic worldview where events must be understood through prior causes, thereby ruling out uncaused actions as unintelligible, but human actions have genuine significance through inner experience, intentions, and moral obligations that cannot be reduced to deterministic explanations, as demonstrated by cases where individuals act against their impulses based on moral duty.

Libertarianism about free will (also known as metaphysical libertarianism or indeterministic incompatibilism) is a philosophical position that asserts free will exists as the genuine ability to do otherwise, meaning our actions are not predetermined by divine plans, physical laws, or brain chemistry; unlike hard determinism (which denies free will exists) and compatibilism (which redefines free will without genuine alternative possibilities), libertarianism maintains that we can actually make different choices and break deterministic causal chains, making it the most metaphysically interesting position on free will.

Libertarianism is a metaphysical position asserting that free will is logically incompatible with a deterministic universe, requiring agents to have genuine alternative possibilities and ultimate responsibility for their actions; this contrasts with compatibilism, which maintains that free will and determinism can coexist, and challenges the Principle of Alternative Possibilities through thought experiments like Frankfurt's counterexamples.

Libertarianism holds that free will and determinism are incompatible, and that we have free will. Libertarians are committed to the falsity of determinism. They are not necessarily committed to contra-causal freedom (actions with no causal explanation) or immaterial souls. The majority accept causal accounts of free will, thinking that what matters is that choices are not deterministically caused, leaving room for indeterministic causation. Prominent libertarians include Alvin Plantinga, Richard Swinburne, Peter van Inwagen, and William Lane Craig. A major challenge is the problem of luck: if something else could have happened at a given time, holding fixed everything before, it seems like luck rather than control.

Three major positions address free will: Hard determinism holds free will is an illusion and we could not have acted otherwise given our circumstances. Libertarianism argues free will exists and is incompatible with physical determinism, claiming humans possess genuine alternative possibilities through a special capacity for self-determination. Compatibilism holds free will is compatible with physical determinism, arguing that freedom means acting according to one's desires rather than against them. The scientific revolution in the 17th century with Newtonian physics made the problem of free will particularly acute by presenting the universe as a self-contained mechanical system governed by objective laws without requiring intelligent guidance.

If determinism is true, criminals cannot be held morally responsible for their actions because they couldn't have done otherwise given their specific combination of genes, upbringing, and environment. This challenges traditional notions of punishment and retribution. Without free will, punishment loses its basis in moral desert. Instead, justice becomes purely consequentialist—focused on preventing future harm rather than punishing past actions. We should view criminals as victims of their circumstances rather than evil individuals deserving punishment. The goal shifts from retribution to protection, similar to how we contain dangerous animals or natural disasters.

Accepting determinism has practical benefits: it eliminates guilt about things that couldn't have been otherwise (like lost relationships). For criminal justice, punishment is justified for deterrence (affecting others' brains) and rehabilitation (preventing future harm), but not for retribution (which assumes people had choices). The speaker argues that retributive punishment like capital punishment is not justifiable under determinism. The just world belief (that people deserve what they get) is also undermined - poverty is not by choice but by environment and genes, requiring more empathy.

Retributive attitudes require belief that people freely choose to harm others. When behavior is understood as caused by biology, retribution loses justification. The law recognizes neurological explanations (brain tumors, severe mental disorders) as exculpatory. Judges who believe in determinism are less punitive. Punishment remains necessary not as vengeance but as a cause-effect relationship aimed at changing behavior through rehabilitation and incapacitation. This preserves practical criminal justice goals while removing personal blame.

Determinism does not mean that punishments cannot influence behavior or that people cannot learn to behave better. People can be discouraged from misbehaving through laws and punishments. The misconception that determinism means we cannot influence behavior is false—kicking a dog every time it comes near will make it stop coming near. The real implication of determinism is that we can investigate scientifically what are the best ways to rehabilitate criminals and how long it takes to reform them, without saying these people are morally responsible in the traditional sense. This removes punishment out of vindictiveness and retribution, which no enlightened person likes.

This section applies determinism to criminal justice, arguing current systems are fundamentally flawed. Coyne notes the law already recognizes mitigating factors (insanity, childhood abuse) that affect behavior, treating some criminals differently. He argues all criminals are like insane criminals—their brains control their behavior regardless of psychiatric diagnosis. Under determinism, three valid reasons justify punishment: sequestration (preventing habitual criminals from reoffending), rehabilitation (helping people become non-dangerous), and deterrence (showing consequences of bad actions). The death penalty and life without parole are rejected as retributive and ineffective deterrents. Norway's approach—putting criminals in humane conditions with regular evaluations and release when safe—achieves 20% recidivism compared to America's 80%, demonstrating rehabilitation works better than punishment. Coyne proposes replacing moral responsibility with practical responsibility focused on reform.

This segment provides a detailed critique of the scientific evidence determinists cite. There is no scientific consensus on whether the universe is deterministic or probabilistic—quantum physics contains multiple competing theories that disagree about mathematics, formal structures, predictions, and what quantum science says about reality. The measurement problem and non-locality remain unsolved. Sam Harris cites three neuroscience studies to argue that our brains make decisions before we are aware of them, but these studies do not actually endorse determinism. The central measurement in Libet's studies (subjective estimates of when subjects think they made conscious decisions) has been discredited. The correlation rates found (65-70%) are barely above a coin toss and cannot support causal conclusions. The studies measure preparatory activity, not actual decisions, and the instructions used are not analogous to deliberative decisions.

Multiple lines of evidence support determinism. First, from first principles: we are made of molecules that obey the laws of physics, which are largely deterministic. Second, brain stimulation experiments show that stimulating the brain causes automatic movements without conscious decisions, and people confabulate reasons afterward. Third, Libet-style experiments using fMRI can predict decisions 6-10 seconds before people are conscious of having made them, with up to 80% accuracy. This demonstrates that conscious will has no effect on decisions - they are made in the brain beforehand. The speaker argues that with better brain scanning technology, predictions could reach nearly 100% accuracy.

This comprehensive section traces the scientific challenge to free will. Newton's 1687 Principia established that knowing positions and velocities of all objects allows perfect prediction of the future, creating a deterministic universe like a perfect machine. Laplace's Demon (1814) formalized this: an intelligence knowing all particle states would see no uncertainty. The brain, made of neurons and electrical currents, is physical matter obeying these laws. In 1983, Benjamin Libet's experiment showed brain activity began 550 milliseconds before participants reported making conscious decisions. Subsequent studies extended this to 7 seconds of neural prediction. Quantum mechanics then challenged determinism at the subatomic level—the Heisenberg Uncertainty Principle states position and momentum cannot be simultaneously known with arbitrary precision. Radioactive decay is genuinely random. However, quantum indeterminism produces randomness, not freedom. Neither determinism (future is fixed) nor quantum indeterminism (future is random) produces the sense of authorship that constitutes free will.

Las leyes de la física y la química determinan nuestras acciones (determinismo). Algunos argumentan que la teoría cuántica nos salva del determinismo, pero si las acciones son causadas por el azar, no son más nuestras que si otras cosas las causaran. El verdadero problema del libre albedrío lo describe J. R. Watson: si nuestro yo determina nuestras acciones, entonces si tenemos libre albedrío, y nuestro cerebro es nuestro yo, entonces nuestro cerebro determina nuestras acciones. En el experimento de Libet, se colocó un aparato en la cabeza de la persona para medir la potencia en varias partes del cerebro. Se descubrió que el cerebro daba la orden de que se moviera la mano 350 milisegundos antes de que la persona tuviera la sensación de que quería mover la mano, y 200 milisegundos después de eso se movía la mano.

JR presents scientific arguments for determinism: (1) Libet's 1983 experiment showed brain activity precedes conscious decision by 500ms, but Libet himself noted consciousness has 'veto power' to stop actions; (2) A 2008 fMRI study predicted simple decisions several seconds before awareness, but this only applies to trained, simple actions with 60-70% accuracy, not complex life decisions; (3) The 'point of no return' shows actions can become unstoppable, but consciousness still regulates early stages. These findings demonstrate unconscious brain processes influence decisions but do not eliminate conscious control.