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    If the neo-Humean motivational psychology embedded in P3 ... — Carmelics
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    Challenges→The Moral Judgment Internalism thesis (MJI) leads to non-cognitive expressivism.

    If the neo-Humean motivational psychology embedded in P3 is false, the inference from MJI to non-cognitive expressivism loses its essential bridge premise.

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    Reasons For

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    • 1.P3's neo-Humean framework assumes desires are prior to and independent of moral judgments, which is logically necessary for the MJI-to-expressivism inference.
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    • 2.If moral judgments can themselves constitute or rationally determine desires, then motivational internalism no longer requires non-cognitivism to explain moral motivation.
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    • 3.Cognitivists about moral properties can preserve internalism via rational motivation, making P3's psychological premise the load-bearing element of the expressivist argument.
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    Reasons Against

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    • 1.The MJI-to-expressivism inference may rely on other premises (like the Frege-Geach problem) that remain independent of whether P3's specific psychology holds.
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    • 2.Alternative non-cognitivisms (quasi-realism, projectivism) can survive even if P3 fails, suggesting the argument has multiple possible bridges, not one essential one.
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    • 3.Rejecting P3 might force a retrenchment rather than collapse of expressivism, undermining claims about 'essential' rather than merely 'important' bridge premises.
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    Truth & Knowledge1 linkedPhilosophy of Language1 linked

    Related

    Alternative non-cognitivisms (quasi-realism, projectivism) can survive even if P...Cognitivists about moral properties can preserve internalism via rational motiva...If moral judgments can themselves constitute or rationally determine desires, th...P3's neo-Humean framework assumes desires are prior to and independent of moral ...
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    Rejecting P3 might force a retrenchment rather than collapse of expressivism, un...The MJI-to-expressivism inference may rely on other premises (like the Frege-Gea...The Moral Judgment Internalism thesis (MJI) leads to non-cognitive expressivism.

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