ialdabaoth comments on Is Spirituality Irrational? - Less Wrong
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What can I say? The compatibilists are wrong. The proof is simple: either all reliably predictable agents have free will, or some do and some don't. If they all do, then a rock has free will and we will just have to agree to disagree about that (some people actually do take that position). If some do and some don't, then in order for the term "free will" to have meaning you need a criterion by which to distinguish reliably predictable agents with free will from those without it. No one has ever come up with such a criterion (AFAIK).
My intuition has always been that 'free will' isn't a binary thing; it's a relational measurement with a spectrum. And predictability is explicitly incompatible with it, in the same way that entropy measurements depend on how much predictive information you have about a system. (I suspect that 'entropy' and 'free will' are essentially identical terms, with the latter applying to systems that we want to anthropomorphize.)
Yes, I think that's exactly right. But compatibilists don't agree with that. They think that there is such a thing as free will in some absolute sense, and that this thing is "compatible" (hence the name) with determinacy/reliable predictability.