In a recent article (“Free Will and the Problem of Evil,” Religious Studies 40 (2004): 437-456), James Cain makes what seems to me to be a rather bold claim regarding free will and the truth of causal determinism. Cain first distinguishes between three kinds of compatibility: metaphysical, conceptual and epistemic. He caches these out in terms of statements. Statements S1 and S2 are metaphysically compatible if and only if there is a possible world where both S1 and S2 are true. Statements S1 and S2 are conceptually compatible if and only if it is conceptually possible that both S1 and S2 are true; that is, the negation of the conjunction of S1 and S2 is not an analytic truth. Finally, statements S1 and S2 are epistemically compatible for a person p at time t only if nothing in p’s epistemic body of evidence at t rules out its being the case that both S1 and S2 are true (for more on these, see pages 438f).
Now, for the claim. “The standard arguments for compatibilism, at most, support a conceptual or epistemic compatibilism” (443) and that the “typical arguments for compatibilism generally do not provide support for metaphysical compatibilism” (444). By ‘typical arguments’, Cain has in mind three general strategies for arguing for compatibilism: paradigm case arguments, conceptual analysis arguments, and arguments employing Frankfurt cases (he specifically mentions Fischer and Ravizza’s arguments in this regard). It is this third sort of argument for compatibilism that I’m most concerned with.
Now, admittedly semi-compatibilism, versus traditional full-blown compatibilism, makes things a little dicey here (In footnote 24, Cain writes that “I do not claim that Fischer and Ravizza argue for metaphysical compatibilism”). So let’s just stick with compatibilism.
Cain thinks that FSCs give “little reason” (448) that there is a possible world where an action is both determined and free. To make things a little easier, he assumes that there is some correlation between brain states and volitions/choices, as Stump and others do (though he doesn’t think this assumption is crucial for his more general point). According to a typical understanding of an FSC, the agent in question actually makes some choice even though she couldn’t have done otherwise; that is, had the agent not made the choice ‘on her own’ as it were, the implanted device (or whatever) would have brought about that very same choice via directly stimulating the brain. This is where Cain takes issue with FSCs. He writes: “The answer to the question of whether a Frankfurt device would cause there to be a choice if it caused the atoms in the brain to move just as they might move if a choice was made is as follows: it depends on what sort of causal powers (if any) are essentially active in choosing, and on whether the device brings it about that those powers are properly exercised” (449). He considers three possibilities: (1) choosing does not essentially involve the exercise of any particular causal powers, (2) choosing essentially involves the exercise of certain causal powers, and those causal powers can be exercised by the manipulation device, and (3) the causal powers involved in choosing may be such that they “issued in any one of two or more mutually exclusive alternatives, and which of those alternatives comes about is not fully determined by factors outside the exercise of that power” (449). Now, if either (1) or (2) were true, then FSCs will have shown free will and causal determinism to be metaphysically compatible. However, “under the assumptions of case 3, the story told by the Frankfurt example may not be metaphysically possible” (450). And until it can be shown that FSCs aren't examples of (3), "there is no reason to accept Frankfurt examples as providing a way to show that one's making a given choice is metaphysically compatible with its being impossible for one not to make that choice" (450).
In general, I'm not usually one to support compatibilism. But I'm struck both by Cain's argument against metaphysical compatibilism, as well as the dialectic at work throughout the article. Has anyone else read it? Thoughts?
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