Very interesting. I wonder, though, if one is able to reply that propositions supervene naturally on a certain state or set of relations (specifically in the brain). Hopefully we see more on this.
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Of course they might. But then would they inherit the causal power of their supervenience base? Or would they, as I suspect, be epiphenomenal?
I can’t answer that definitively, but mightn’t a Broadian version of emergence help shed some light on that particular problem? Perhaps there are novel causal powers that emerge with propositional attitudes. I suspect not, but it seems that there are some that would answer that objection this way (Timothy O’Connor, for example).
I find it hard to believe that in a naturalistic world brand new laws suddenly show up just in time to bring free moral agents into existence.