My argument would go something like this: If you are the computer, then it is free will. If you could predict the computer, you could argue, but you can’t. You can’t even do this theoretically since you’d need more mass than the universe and can’t initialize your predictive model. So you can only say “that decision was made inside that brain”. That is at least one sensible definition of free will.
It’s like looking at a motor that breaks down and then saying that it’s not really the motor that breaks because the motor had no choice in it’s parts breaking. That’s just rhetoric.
The error I believe is that we don’t want to accept that sentience can arise from mechanical universe and it’s a matter of degree and that this can create meaning. People want to set the bar higher because they want the idea of some type of “pure mind”. But since we’re already discussing the meaning of all these things, arguing that what you are reading is just quantum physics is rhetoric.
Either what you are saying is supposed to be meaningful, or you concede that your words are meaningless. Then I anyone else wins the argument by default ;)
Basically the definition of free will can only be made by someone who claims that meaning exists, emerging from the material world. Therefor within that emergent layer of mind and meaning, a definition of free will other than basic physics is at least acceptable.
Well imagine we could copy or approximate a human mind and run it on a typical computer, free from an quantum effects. From the outside you would say “no this is not a mind, this is a computer!” (I threw it on the ground). You could restart a human mind simulation (which would be deeply unethical of course) and it would return the same results, but it would still not be predictable outside of such a simulation.
But from the inside your mind you would of course say you have free will because that is how you defined it. The word has meaning because we created the meaning. In a universe with only such PC based human minds, you wouldn’t argue that you don’t have free will because we’re just software running silicon chips. Otherwise you’d have to invent a new word for what you meant with free will, like internally derived mental agency or something. But that is just rhetoric.
A classical computer based human mind would in fact be more free since it could investigate, analyze and edit it’s own mind, overcoming things that it perceives as weaknesses or faults. Like my evolutionary programming might have made me biased to conserve energy and time and not think too hard on certain new information, dismissing it instead. Maybe instead you’d want to be more open minded. That still would be repeatable and deterministic but arguably more free than a normal human mind.
So I think arguing that free will is based on determinism, repeatability or predictability is sort of an appeal to a “pure mind”. Not sure if that is a good way to put it, but like appealing to higher standard like we’re supposed to be a supernatural soul or something. We’re not, but we still came up with that word all on our own.