At the quantum level perhaps, but my understanding is that quantum level indeterminism isn't likely to play much of a role in the functioning of the human brain

At the quantum level perhaps, but my understanding is that quantum level indeterminism isn't likely to play much of a role in the functioning of the human brain. Even if it were, while it might seem to theoretically at least allow for free will, it doesn't help explain what it really means at the physical level. Personally I accept that the only sensible explanation is that it's an illusion, but it's a sufficiently powerful illusion that's essentially indistinguishable from what genuine free will might actually be, and hence there's little point worrying about whether it genuinely exists. I do worry a little what it might mean for our criminal justice system if gradually everyone were to accept free will was just an illusion though.