Hard Determinism: If It's All Caused, Are You Choosing?

Hard determinism is the view that determinism is true, that it is incompatible with free will, and therefore that free will does not exist. Every event — including the thought you are having right now — is the necessary result of prior causes operating under fixed laws. Rewind the universe to a moment before any decision, replay it with every particle in the same place, and you get the same outcome, every time. The standard reaction to this idea is a quiet dread, as if something has been taken from you. But the dread rests on a confusion worth naming: it grieves a kind of freedom you never actually used to make a single decision.

That confusion is the whole subject of this piece. The claim itself is not especially controversial among people who think about it for a living — what’s controversial is what it’s supposed to mean for how you live. And the gap between the two is where almost every popular treatment of the topic stops.

What hard determinism actually claims

The position has two parts, and the second is the one that bites. First: determinism is true — every event has prior causes, and given those causes, it could not have unfolded otherwise. Second: this is incompatible with free will. Both halves matter. Plenty of philosophers accept the first and deny the second; they’re called soft determinists, or compatibilists, and we’ll get to them. The hard determinist takes both: the causal chain is unbroken, and an unbroken causal chain leaves no room for a free will.

The American philosopher William James coined the “hard” and “soft” labels in the nineteenth century, and the distinction has held up because it’s clean. Soft determinism is a form of compatibilism — free will survives. Hard determinism is a form of incompatibilism — it doesn’t. If you’ve ever felt that “everything is determined” and “I freely chose” can’t both be true, you were reasoning like a hard determinist.

A real-life example

Think about the last decision you’d defend as freely made. Say you quit a job. It felt like deliberation: you weighed the salary, the commute, the slow erosion of your weekends, and you chose.

The hard determinist doesn’t deny the deliberating happened. They deny it could have gone any other way. The weights you assigned were set by your temperament, which you didn’t pick, shaped by every prior experience of work, which you didn’t author, processed by a brain whose wiring you didn’t design. The deliberation was a real physical event — and a fully caused one. Run that exact brain, in that exact state, against that exact job, and it quits every time. The sense of an open future, of genuinely-available alternatives, is what the position calls into question. Not the experience of choosing. The reality of the road not taken.

The two things we call “free will”

Here is the move that dissolves most of the dread, and it’s a distinction, not a refutation.

When people say “free will,” they’re usually running together two different things. The first is metaphysical free will: the ability to have done otherwise in an identical universe — to rewind the tape and take the other branch. The second is experienced agency: the felt process of weighing options, imagining outcomes, and acting on the result. We call both of these “choosing,” which is exactly why the news lands so hard.

Hard determinism comes for the first kind. It says the rewound tape always plays the same. But it leaves the second entirely untouched. Your deliberation still runs. Your reasons still cause your actions rather than your fears or someone else’s orders. You still face options that feel open and resolve them by thinking. Every part of choosing that you have ever actually done survives.

This is worth being honest about. A committed hard determinist will say that experienced agency is “just” caused too, and so doesn’t deserve the name freedom at all. That’s a fair challenge, and it’s why this is a reframe rather than a knock-down argument: it doesn’t prove the metaphysics wrong. What it does is separate the thing you’re mourning from the thing you’re actually using — and once they’re apart, the loss looks a great deal smaller than the panic suggested.

The case for it — Laplace’s demon and the lab

Why believe the first half at all? The short version is: because science keeps working. Since Newton, the assumption that every event has a complete causal explanation has been the engine of every prediction we’ve ever made. The French scientist Pierre-Simon Laplace put it most starkly: an intellect that knew the position and momentum of every particle could, in principle, compute the entire future. There’s no special exemption carved out for the three pounds of matter behind your eyes.

The neuroscience is suggestive rather than decisive, and it’s worth not overstating. Benjamin Libet’s experiments in the 1980s found measurable brain activity — a “readiness potential” — beginning before subjects reported a conscious decision to move, which some read as the brain committing before “you” do. The interpretation is genuinely contested: critics argue the readiness potential reflects general anticipation, not a specific decision, and that pressing a button in a lab tells us little about reasoned choices made over days. Treat Libet as a famous data point in an open argument, not a verdict.

The usual escape hatch is quantum mechanics — physics isn’t strictly deterministic at the smallest scale. But indeterminism doesn’t rescue free will; a choice produced by a random quantum flutter is no more yours than one produced by a fixed chain. Randomness isn’t freedom. It’s just noise.

Who the famous hard determinists are

The lineage is older than the lab. Spinoza, in the seventeenth century, argued that a thrown stone, if it were conscious, would believe it had chosen to fly — and that we are in exactly that position, conscious of our actions but ignorant of their causes. Two centuries later Nietzsche turned the same suspicion into a working psychology, treating our conscious reasons as the after-the-fact alibi of drives we never see. The Enlightenment materialist Baron d’Holbach made the case in fully naturalistic terms.

The reason the topic is everywhere right now is contemporary, though. The neuroscientist Robert Sapolsky argues the hard-determinist case at book length in Determined (2023), drawing on the biology of behaviour. The philosopher Sam Harris made the popular version in his short book Free Will. What’s striking — and what most articles miss — is that both of them treat the conclusion as liberating, not bleak. Which brings us to the part that actually matters.

Why most philosophers reject it

Before the liberating part, a caveat: most professional philosophers are not hard determinists. They’re compatibilists. Their move is to deny that free will requires the rewind-the-tape ability at all. The freedom worth wanting, they argue, is simply acting according to your own reasons, free of external coercion — and a deterministic universe doesn’t remove that. On this view the prisoner is unfree and the person choosing dinner is free, determinism notwithstanding, because the relevant difference is coercion, not metaphysics.

You’ll notice this is close to the “experienced agency” half we separated out earlier. That’s not a coincidence. The compatibilist and the consoled hard determinist often end up valuing the same thing — they just disagree about whether it earns the word “free.” Which tells you the live question was never really “do we have free will?” It was always “which freedom were you counting on?”

Why believing it feels like despair — and why it needn’t

The fear is concrete, and it’s worth stating plainly: if I couldn’t have done otherwise, then nothing is up to me, so why try, why care, why get out of bed. That’s the slide into fatalism, and it’s a real psychological risk. Some research has suggested that priming people to disbelieve in free will can nudge them toward cheating or less helpful behaviour — though those findings are contested and have replicated unevenly, so lean on them lightly.

But fatalism is a misreading, and you can see why by looking at what fatalism actually claims. Fatalism says the outcome will happen regardless of what you do — the appointment in Samarra, arriving no matter which road you take. Determinism says something almost opposite: the outcome happens because of what you do, including your effort, your deliberation, your trying. Your action isn’t bypassed by the causal chain. It’s a link in it. Stop trying and the outcome changes, because your trying was one of the causes.

Fatalism says it will happen no matter what you do. Determinism says it happens because of what you do. Your effort isn’t outside the chain of causes — it’s one of the links.

There’s a quieter gift underneath, and it’s the one Sapolsky reaches for. If people genuinely could not have done otherwise — given their biology, their history, the state of their brain in that moment — then the case for contempt softens. Not the case for prevention: you still stop the harm, still protect people, still build conditions that produce better behaviour. What loosens is the appetite for blame for its own sake — the satisfaction of punishment as opposed to the work of prevention. And the same mercy turns inward. The cruelty you direct at your past self, for the decision you “should” have made, assumes a version of you that could have stood in that exact moment, with that exact brain, and done better. Hard determinism says: no such version existed. There was only the you that was there.

Held that way, the belief is less a sentence than a release. It is, arguably, the most powerful self-compassion tool philosophy has — though that’s a claim the idea has to earn in your own life, not one you should accept because a sentence asserted it.

One honest tension remains, and it’s worth naming rather than smoothing over. The same logic that dissolves your self-blame also dissolves blame for the people who hurt you. “They couldn’t have done otherwise” can feel less like wisdom and more like being asked to excuse the inexcusable. It isn’t — understanding a cause is not endorsing an outcome, and you can hold someone fully accountable, remove them from your life, demand they be stopped, without also needing them to be metaphysically guilty. But if that distinction feels like cold comfort, that’s a reasonable place to sit with it rather than rush past.

Causal humility without fatalism

The position that everything is caused, and that you should nonetheless deliberate, take responsibility, and engage fully, is not a modern compromise. It’s roughly the Stoic view, worked out twenty-three centuries ago.

The Stoics were thoroughgoing determinists. They believed the cosmos was a single unbroken web of cause — fate, they called it — and Marcus Aurelius states it as flatly as any modern materialist: whatever happens to you “was also, from all eternity, destinated and appointed.” And yet the Stoics were the great teachers of effort, duty, and self-command. How?

Because Chrysippus, the philosopher who built most of Stoic logic, had already answered the objection we now call fatalism — the “idle argument,” which said that if everything is fated, effort is pointless. His reply was that some outcomes are co-fated: they come about precisely through the engaged agent, not around them. Recovering from illness may be fated — but fated to happen by way of your calling the doctor. The fate doesn’t bypass your action. It runs through it. Your effort is not futile against the causal order; it is the causal order, doing its work as you.

This is the practical resolution, and it asks for something I’d call causal humility rather than surrender. You hold, at the same time, two things that only sound contradictory: that you are fully caused, and that your deliberation is real and matters. The first dissolves the self-contempt — there was never a better you that could have stood in that moment. The second keeps you in the game — your trying is a cause, so it is never wasted. This is a different question from how much control we feel we have over events, which is the territory of our sense of agency and where we locate it; here the question is whether the will is free at all, and the Stoic answer is that it doesn’t need to be, in the rewind-the-tape sense, for your engagement to count.

It’s the same shape as other questions that look like trapdoors and turn out to be doorways — the kind explored across philosophy as practical psychology, where an idea that seems to threaten everything, examined closely, threatens almost nothing you were actually using. Hard determinism is one of those. It takes a freedom you never held, and hands back, in exchange, a reason to be kinder to the only self you ever had.