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Inverse View
It is not the case that If reason can identify principles that apply necessarily and universally to all rational beings, then reason is itself a sufficient ground for morality.
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Reasons For
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Reason for
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1.
Identifying universal rational principles describes how rational beings think, not what makes actions morally right or wrong.
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2.
Two rational beings can universalize contradictory maxims and find both logically consistent with reason alone.
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3.
Morality requires motivational force; reason alone tells us what follows, not why we should care about following it.
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Reasons Against
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Reason against
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1.
Moral principles that bind all rational beings must derive from what all rational beings share: the structure of reason itself.
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2.
If morality requires a non-arbitrary foundation, it cannot depend on contingent desires, emotions, or cultural variation among agents.
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3.
Reason can identify logical contradictions in willing maxims universally, establishing necessity without external authority.
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