Free will, determinism and compatibilism: QCE Philosophy and Reason
“Explain and evaluate the free will debate, including hard determinism, libertarianism and compatibilism, and the link to moral responsibility”
Determinism holds that every event, including every choice, is necessitated by prior causes, which appears to conflict with free will, understood as the power to do otherwise and to be the source of one's acts. Hard determinism accepts determinism and concludes free will and moral responsibility are illusions. Libertarianism holds we are free and determinism is false, but faces the luck objection that an undetermined choice may be merely random. Compatibilism redefines freedom as acting from one's own uncoerced desires (Hume), or on desires one endorses (Frankfurt), preserving responsibility while accepting causation, though the consequence argument objects that this never secures the ability to do otherwise. The debate decides whether praise, blame and retributive punishment are justified.
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What this dot point is asking
QCAA wants you to engage a central problem of metaphysics: whether we have free will given that every event seems to have prior causes, and what this means for moral responsibility. You need the determinist thesis, the three main positions (hard determinism, libertarianism, compatibilism), the key arguments, and the stakes for praise, blame and punishment.
The answer
The problem
Determinism is the thesis that every event, including every human choice, is the necessary effect of prior causes governed by the laws of nature. If that is true, then given the past and the laws, only one future is possible. Free will is usually understood as the power to have done otherwise and to be the genuine source of one's actions. The problem: free will and determinism seem to conflict, yet both seem compelling. Three positions respond.
Hard determinism
Hard determinism accepts determinism and concludes that free will is an illusion. Since our choices are fully caused by factors ultimately outside our control (genes, upbringing, brain states), we could never have done otherwise, so no one is truly free or morally responsible. This challenges retributive punishment and desert-based praise and blame. The cost is that it conflicts sharply with our experience of deliberating and choosing.
Libertarianism (metaphysical)
Libertarianism (not the political view) holds that we do have free will and therefore determinism is false, at least for human choices. Some libertarians locate freedom in an undetermined act of the will or agent-causation, where the self originates an action not fully fixed by prior causes. Strength: it preserves robust responsibility and matches the felt openness of choice. Objection: an undetermined choice can look merely random, and randomness is no more free than determinism; this is the "luck" problem.
The consequence argument
A powerful argument against compatibilism (set out by Peter van Inwagen): if determinism is true, our acts are consequences of the laws of nature and events before we were born; but we cannot change the laws or the distant past; so we cannot change the fact that our acts occur. Hence, if determinism is true, we are not free in the sense of being able to do otherwise.
Compatibilism
Compatibilism denies the conflict: free will and determinism are compatible. It redefines freedom not as uncaused action but as acting according to one's own desires without external compulsion. David Hume argued that freedom is just the absence of constraint: a person acts freely when they act from their own will, even if that will is itself caused. Harry Frankfurt refined this: a person is free when their action flows from desires they endorse at a higher level (a "second-order" desire), distinguishing a willing agent from an addict who acts against their own deeper wishes. Strength: it preserves moral responsibility while accepting causation. Objection: critics (via the consequence argument) say it changes the subject, since it never secures the ability to have done otherwise.
Moral responsibility
The debate matters because responsibility seems to require freedom. If hard determinism is right, praise, blame and retributive punishment may be unjustified, though we might keep punishment for forward-looking reasons (deterrence, reform). Compatibilists argue responsibility survives because what matters is whether the act flowed from the agent's own reasons-responsive will. Recent neuroscience (often citing Libet-style experiments suggesting the brain initiates action before conscious awareness) is sometimes taken to support hard determinism, though the interpretation is heavily contested.
The consequence argument is the strongest case that determinism rules out free will. Construct and evaluate it.
Step 1: State the premises precisely
P1: If determinism is true, our acts are the necessary consequences of the laws of nature and events in the distant past. P2: We have no power over the laws of nature or over what happened before we were born.
Step 2: Draw the conclusion validly
If we cannot change the inputs (laws and past) and the inputs necessitate our acts, then we cannot change our acts either. C: So if determinism is true, we are not able to do otherwise, and thus not free in the "could have done otherwise" sense.
Step 3: Locate where each position resists
The hard determinist accepts the whole argument. The libertarian rejects P1's antecedent by denying determinism for choices. The compatibilist must challenge the inference, arguing that "able to do otherwise" means "would have done otherwise had one chosen differently", which is compatible with determinism.
Step 4: Evaluate the compatibilist move
This conditional analysis preserves responsibility, but critics say it changes the subject: it secures a hypothetical ability, not the categorical ability the argument targets. Whether that is enough for responsibility is the crux of the debate.
Where hard determinism and libertarianism agree that free will requires being undetermined, compatibilism breaks the deadlock by redefining freedom as acting from your own uncoerced desires. On Frankfurt's version you are free when you act on desires you endorse, which is why the willing agent differs from the addict, even if all desires are caused.
- Confusing metaphysical libertarianism with the political view
- Here it is the claim that we have free will and determinism is false, not a theory of the state.
- Treating an undetermined choice as obviously free
- If a choice is merely random it is not under the agent's control, which is the luck objection to libertarianism.
- Assuming determinism destroys responsibility
- Compatibilists argue responsibility survives if the act flows from the agent's own will.
- Overstating the neuroscience
- Libet-style results are contested and do not straightforwardly show that conscious choice is causally idle.
Try this
Q1. Distinguish hard determinism, libertarianism and compatibilism. [4 marks]
- Cue. Hard determinism: determinism true, no free will; libertarianism: free will real, determinism false; compatibilism: both true once freedom is redefined.
Q2. Explain the luck objection to libertarianism. [3 marks]
- Cue. An undetermined choice may be random, and a random act is not under the agent's control, so not free.
Q3. Explain how compatibilism preserves moral responsibility. [3 marks]
- Cue. Responsibility requires acting from one's own uncoerced, endorsed desires, not being uncaused.
Exam-style questions
Questions in the style of QCAA exam questions on this dot point, each with a worked answer. They are written by ExamExplained unless tagged "Past paper"; the year shows the paper a question is modelled on.
Practice7 marksCompare compatibilism with hard determinism as accounts of free will and moral responsibility, and evaluate which gives the more defensible account of when we are responsible for our actions.Show worked answer →
A 7 mark response sets out both positions, contrasts them, and reaches a justified verdict.
Hard determinism. Accepts that every choice is fully caused by prior factors outside our control, concluding that free will and desert-based responsibility are illusions. Praise, blame and retributive punishment lose their basis (though forward-looking deterrence might remain).
Compatibilism. Denies the conflict by redefining freedom as acting from one's own uncoerced desires (Hume), or on desires one endorses at a higher level (Frankfurt). Responsibility survives because what matters is whether the act flowed from the agent's reasons-responsive will, not whether it was uncaused.
Evaluation. Compatibilism better fits our practices of holding people responsible and the distinction between the willing agent and the coerced addict. But the consequence argument objects that it never secures the ability to have done otherwise, which hard determinists say real responsibility requires. A defensible verdict: compatibilism gives the more workable account of responsibility, provided "could have done otherwise" is read as "would have, had the agent chosen differently".
Markers reward an accurate contrast, use of Hume or Frankfurt, the consequence-argument objection, and a justified conclusion.
Practice5 marksExplain the luck objection to libertarian free will, and assess one possible libertarian reply.Show worked answer →
A 5 mark response states the objection and evaluates a reply.
The objection. Libertarianism says a free choice must not be fully determined by prior causes. But if a choice is genuinely undetermined, then given exactly the same prior state the agent might have chosen either way, which makes the outcome a matter of luck or randomness. A random event is not under the agent's control, so it is no more free than a determined one. Indeterminism seems to undermine control rather than secure it.
A libertarian reply. Agent-causation theorists answer that the agent (a substance, not just prior events) directly causes the choice, so it is neither determined nor random but originated by the self. Assessment: this preserves control in principle, but critics charge that agent-causation is obscure and does not explain why the agent caused this choice rather than another without reintroducing either prior causes or luck.
Markers reward a clear statement of the luck dilemma and a critical assessment of a libertarian response.