Concept

Hard Determinism

Intro

Hard determinism is the view that free will does not exist. Every choice you make, every "decision," every action, is the necessary product of prior states: your genes, your brain chemistry, your upbringing, the laws of physics. The sense that you are choosing is real, but the choosing itself is an illusion. The film was already in the can; you just have not seen the rest of it yet.

Sam Harris is the best-known modern advocate. His short book Free Will (2012) argues from neuroscience: brain scans show electrical activity associated with a decision arising before the conscious self is aware of having decided. If the brain has already started executing the choice before "you" know about it, the choice was never yours; it was your brain's.

This sits to the side of compatibilism, which agrees the universe is determined but redefines "free will" to mean "doing what you want, even if what you want was determined." Hard determinists say compatibilists are changing the subject. It also sits to the side of libertarian free will, which agrees you would need to be the ultimate originator of your actions for them to be free, and concludes you actually are.

The Christian disagreement: if hard determinism is true, then no one ever really chooses anything. There is no real moral responsibility, no real evil that anyone could have refrained from, no real love, no real sin. The categories of praise and blame, gratitude and resentment, justice and forgiveness all rest on the assumption that the person could have done otherwise. Hard determinists tend to argue we should keep using these categories instrumentally even though they are technically empty. Christians tend to reply that you cannot run a civilization on a fiction you know to be a fiction, and that the universal human experience of choosing is data the determinist owes an explanation for, not data to dismiss.

The position is also self-undermining if pressed hard: the determinist's argument for determinism is itself just the necessary output of his brain chemistry, not a tracking of truth. The premises of the argument and the act of believing them get pulled into the same machinery the position describes.

In full

The position that free will does not exist, that all human actions are causally determined by prior states (genetic, neural, environmental, social), and that "freedom" in any sense capable of grounding genuine moral responsibility is an illusion. Hard determinism shares with Compatibilism the thesis that the world is causally determined, but draws the opposite conclusion about freedom and responsibility: where the compatibilist preserves freedom by redefinition, the hard determinist judges the redefinition a face-saving evasion and accepts the consequences. It is largely (though not exclusively) a secular position; its theological corollary is rare but appears in extreme hyper-Calvinist or fatalist streams.

Core claim

Two theses, the second following from the first plus a libertarian premise about responsibility:

Causal determinism is true, every event, including every human deliberation, choice, and action, is the necessary consequence of prior states of the world together with the laws of nature (or of God's eternal decree, in the theological version).
Genuine moral responsibility requires the agent to be the ultimate originator of her action (a libertarian intuition the hard determinist endorses), but determinism precludes such ultimate origination, so genuine moral responsibility is ungrounded.

The contemporary version (Pereboom's hard incompatibilism) does not even require determinism to be true; it argues that free will fails on either deterministic or indeterministic metaphysics, since indeterminism only adds randomness, which is no better than determination for grounding responsibility.

Distinguish from rivals

vs. Compatibilism, agrees with the determinist metaphysics, disagrees about whether redefining freedom rescues responsibility. Hard determinist view: the compatibilist has changed the subject.
vs. Libertarian Free Will, agrees with the libertarian's requirement that responsibility needs ultimate origination / contra-causal freedom; disagrees that we have it. Where the libertarian says "we have it, therefore determinism is false," the hard determinist says "determinism is true, therefore we don't have it."
vs. fatalism, fatalism says outcomes are fixed regardless of prior causes (e.g., "you will die at noon no matter what"). Determinism says outcomes are fixed because of the chain of causes. Hard determinists are causal determinists, not fatalists.

The argument from neuroscience (Sam Harris)

Sam Harris (Free Will, 2012) advances a vivid version drawing on neuroscience and introspection:

Brain-imaging studies (Libet 1983; Soon, Brass, Heinze, Haynes 2008) show that decisions can be predicted from neural activity seconds before the agent reports being aware of choosing.
Introspectively, our thoughts and intentions arise in consciousness; we do not author them. The next thought you have was not chosen by a prior you who chose to choose it.
The agent has no control over the genes she was born with, the environment she was raised in, the neural events that produce her present desires, or the cascade that produces her present choice.
"Free will", understood as the capacity to be the uncaused cause of one's actions, is therefore not just empirically dubious but conceptually incoherent.

Harris's distinctive move: this conclusion does not entail nihilism or the collapse of ethics, law, or self-improvement. We can still distinguish those who act from compulsion from those who act from settled character; we can still incentivize, punish, and rehabilitate; we can still want certain outcomes and work for them. What we cannot do is hold anyone ultimately morally accountable in the retributive sense.

Pereboom's hard incompatibilism

Derk Pereboom's Living Without Free Will (2001) and Free Will, Agency, and Meaning in Life (2014) develop a more philosophically careful version:

The manipulation argument (four-case): if a neuroscientist could manipulate an agent's brain so the agent forms the very desires that produce a wrongful act, the agent would satisfy compatibilist conditions for responsibility but should not be held responsible. Run the case through diminishing degrees of intervention until you reach normal causal determinism, the relevant features remain constant, so responsibility fails throughout.
Indeterminism doesn't help, adding quantum indeterminacy or libertarian agent-causation either produces randomness (which is no better) or posits an unexplained agent-causal power that has no place in the natural order.
Living without free will is livable. Retributive blame, guilt, and resentment must be revised, but love, agency, life-satisfaction, and the quest for meaning all survive in modified form.

Galen Strawson and the basic argument

Galen Strawson (Freedom and Belief, 1986; "The Impossibility of Moral Responsibility," 1994):

To be ultimately morally responsible for an act, you must be the cause of yourself (causa sui) at least in the relevant respects.
Nothing can be causa sui. To choose your own character, you would need to be acting on prior character traits, which you didn't choose.
Therefore, ultimate moral responsibility is impossible.

This argument is independent of empirical neuroscience; it is a conceptual a priori point about the structure of agency.

Spread of positions (where Hard Determinism stands)

A secular position in mainstream contemporary philosophy of mind, defended by Sam Harris, Derk Pereboom, Galen Strawson, and (in earlier 20th-c. form) Baron d'Holbach, John Hospers, and B. F. Skinner.
Largely not a Christian position, since orthodox Christianity affirms genuine moral responsibility, divine judgment, and meaningful obedience. The doctrine of hell, in particular, presupposes culpability.
A theological corollary appears in extreme hyper-Calvinism (where divine determinism is taken to undercut the genuine free offer of the gospel) and in some streams of Islamic occasionalism / jabriyya (Ash'arite traditions emphasizing absolute divine determination). Mainstream Calvinism explicitly rejects this: Reformed theology is compatibilist, not hard determinist.
vs. Compatibilism: opposed; hard determinists view compatibilism as evasion.
vs. Libertarian Free Will: opposed; hard determinists view libertarianism as empirically and conceptually unsupported.
vs. Open Theism: opposed; Open Theism is the most strongly anti-deterministic theological position.

Standard objections (steel-manned)

The self-defeat objection. If determinism is true, then the determinist's belief in determinism is itself the product of prior causes, not of genuine rational evaluation. So the argument for determinism is not a reason for accepting it but a cause of accepting it. (C. S. Lewis, Miracles ch. 3; Plantinga's Evolutionary Argument Against Naturalism; the Argument from Reason.) Harris and Pereboom have replies (the cognitive process can still be reliable even if determined), but the worry is structural.
The moral responsibility objection. Our entire moral, legal, and interpersonal life is structured around holding people responsible. If hard determinism is true, this entire structure is built on a fiction. Pereboom's reply: the structure can be revised, forward-looking (consequentialist, rehabilitative) responsibility survives; only backward-looking (retributive) responsibility is lost.
The introspective objection. Our experience of deliberation and choice, of weighing reasons and acting on them, seems direct evidence of free agency. Hard-determinist reply: introspection is unreliable; the experience of "choosing" is a post-hoc narrative laid over neural events that already determined the outcome.
The theological objection. Scripture commands, exhorts, judges, and rewards, presupposing genuine creaturely agency. Hard-determinist reply (when made): the framework of commands and judgments is itself part of the deterministic causal order, shaping behavior.

Tensions

Internal coherence: if every belief is causally determined (including the belief in determinism), the epistemic status of accepting determinism is itself in question. This is the deepest objection.
Compatibility with moral practice: hard determinists generally argue practice can survive in modified form, but critics (Strawson père, Smilansky) argue we cannot live consistently with the doctrine.
The position is rare in Christian theology because divine judgment, hell, and the warnings of Scripture appear to require genuine moral agency.