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I think the burden of proof is more on the believers in free will, because at first blush libertarian free will seems to be conceptually incoherent.
In order to have the type of free will we want, determinism has to be false. That is, for a given fixed state of the universe (i.e. reality as a whole, both the physical and whatever non-physical components you believe in), there have to be multiple other possible states that could follow afterwards. But what explains how we select one outcome over the other? It can't be anything in the universe itself, even the alleged "will", because everything that goes into making up the state of the "will" has also been fixed at one specific instant. There isn't any possible explanation for how we select one outcome over the other except to say that it's "just because". That is, it's random. But a purely random selection isn't free will either.
I can't conceive of a space between determinism and randomness where free will could exist. It's possible that I'm just missing something here, or there is such a thing as free will and it's just absolutely indescribable in any terms that we could possibly understand, but right now it makes more sense to me to just say that free will is an illusion.
I think the system is a lot more resilient than that. Science can be molded into a tool for political purposes just like any other human institution. Scientists never used to believe in 20 genders, but now they do, and the sociological reasons for the shift in scientific consensus are obvious. If science was dethroned from its current position as the arbiter of truth, then whatever took its place would just be forced to conform to the dominant political narrative instead.
If anything, elements of progressivism are more at home with a non-materialist ontology than a materialist one, e.g. mind-body dualism so you could have a female mind/soul in a male body.
Compatibilism, which OP dismisses out of hand without really describing it, is the generally-accepted answer to this question.
It basically does the magic trick of saying 'we all agree that we have some intuitive notion of free will which is very very important, and a cultural narrative says it is at odds with determinism, but that just means randomness which is clearly wrong. We suggest a new definition for the term 'free will' which is compatible with determinism, and if that new definition resonates with your intuitions then you should just adopt it as what you mean when you talk about free will from now on'.
The definition is, basically, how much the actions and outcomes of an agent in a deterministic system are caused by its own nature and preferences, versus caused by external constraints and contingent factors of the system.
Basically, if you have the freedom inside a system to act mostly how you want and have steering power over your own future, you have free will. It doesn't matter that how you act and what you steer towards is deterministic; it is still your own nature which causally determines your own actions and outcomes, rather than some other outside force.
And, if you are restrained and restricted and forced into actions against your nature and futures that you would not choose, then you have very little free will. This is a system in which your own nature and preferences has very little causal impact on how the system evolves over time, you have very little input or control, and the argument is that that's what the felt experience of having your free will violated actually corresponds to.
I think it's a pretty good idea.
I think it's just true that the idea that free will is opposed to determinism is an accident of history, where humans have an innate sense of being in-control or not-in-control of themselves and their destiny, and some philosophers and religious scholars hijacked that innate sense and built a narrative about God's Plan vs human nature and the origin of sin/pain vs materialism and scientific realism vs etc etc.
But that innate sense didn't have to be channeled into that specific debate. If you put kids on a dessert island and let them grow up outside culture and queried them about that innate sense as an adult, they wouldn't say 'obviously this is about whether the universe is deterministic or not'.
So, given that we've demonstrated that the narrative about determinism it got attached to ends up being pretty incoherent and has no answer which satisfyingly aligns with our intuitions, I think it totally makes sense to just say 'so lets throw out the idea that our sense of 'free will' has anything to do with that question, and find a better definition that matches out intuitions better.'
And I think Compatibilism offers a good version of that.
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I can conceive of a model where the human brain is somehow connected to some higher 'free will dimension' where there's some ethereal being (call it a soul) that is capable of observing a person's environment and acting in some small way to impact the outcome of their decisions against what their immediate environment would demand.
For example, what if there were a single neuron or a couple neurons, deep in the brain, that were specialized to act as 'antennae' to this higher dimension, and by activating or deactivating this neuron, and the cascade effects this would have on the rest of our cognitive processes, the actual behaviors we exhibit are meaningfully altered? How could we detect and identify such a neuron amongst the billions of others in the brain?
This is not the literal model I propose, but just example of a biological, materialist understanding of human cognition could still have some blind spot we are simply unable to detect, which nonetheless does create some version of 'free will' beyond our understanding.
Major objections to this:
A) This just pushes back the materialism/determinism debate to this new dimension/realm, what makes the ethereal being any more 'free' in its own terms? I'd still chalk this up to a sort of 'mystery' we can't solve under current tech, and thus still a mysterious, supernatural phenomenon.
B) Even if true, it's just 'free will of the gaps.' The vast majority of the universe remains uncaring and humans making free will decisions is so irrelevant that the rules of physics need not even consider this issue to rule.
C) It is special pleading in the extreme. Why are human brains the only thing that could have such an antennae? Why not cats? or cows? or fish, insects, trees, or even rocks? There are massive unstated assumptions as to why the human brain would have access to "The free will dimension" and yet other configurations of matter would not. How would this even evolve unless it was an intentional design?
Ultimately this is the same class of argument as e.g. Maxwell's Daemon, (IF this impossible thing exists, natural laws could be falsified!) but it is barely enough for me to leave aside some small probability for things working in ways we haven't fully understood yet.
I’ve seen a really appealing idea that the sort of “observer” you use for quantum experiments allows for an expression of free will. If our brains had some quantum-scale machinery which put a thumb on the scale when collapsing waveforms, then maybe we could sneak in some concept of preferences. Then we mumble mumble multiverses, and…
Needless to say, this was somewhere on LessWrong. I also think it was followed by the most gentle sort of debunk: an article saying that scientists had worked on one or more testable claim from the theory, and found it wanting. Sadly, I can’t find either.
You don't need quantum mechanics for that sort of interference though. Even in an apparently deterministic universe, you could just say that your mind influenced what happened. Quantum mechanics adds nothing to either the plausibility or mechanics of the thought experiment.
That's what OP is suggesting and it works in every possible universe. There are an infinite number of possible models that describe our universe and the only thing constraining them is their complexity.
Rationalism is choosing the least complex option; because, it makes the best predictions.
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Materialist science already answered this question. Multiple possible other states can follow from a single fixed state as described here.
And there's no hidden variables that we just haven't seen yet that would explain away single state -> multiple possible states, either.
The likelihood of a quantum system collapsing into a given state is rigorously mathematically specified by the wavefunction. If a will or agent was making a "choice," we wouldn't expect those choices to perfectly obey the wave function. It's like spinning a roulette wheel or rolling dice - just because we don't know the outcome in advance doesn't mean any free will is involved.
Agreed. But it at least lets us skip any debates about determinism. It has already been demonstrated wrong. The absence of determinism isn't actually useful for identifying free will, however.
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Doesn't this just add randomness into the mix? I'm not seeing how this contributes any to the concept of free will.
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I think a better way to phrase it is that it's just a poorly-defined concept that ends up functioning as a motte and bailey. "Illusion" makes it sound like something constantly apparent but untrue, rather than just a confused way of thinking about a concept. In the motte, he can declare that things that happen for a reason are "deterministic" and thus not free will, while things that don't happen for a reason (like the outcomes of quantum randomness) are "random" and thus not free will, and then imply that magic can produce results that are neither caused nor uncaused and thus free will is proof of magic. But then when the time comes to argue the existence of "free will" he doesn't have to do anything to argue that something can be neither caused or uncaused, just that people make decisions. Well yes, I believe that people make decisions, I am a "compatibilist" who thinks that people can make decisions with their brains even when those decisions are caused by prior events. I just think that those decisions are some mixture of caused and uncaused rather than some incoherent third thing that has been arbitrarily associated with magic.
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