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Inverse View
It is not the case that Any practical argument that concludes with a prescriptive statement must contain at least one prescriptive statement among its premises
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Reasons For
2 perspectives
Reason for 1 of 2
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1.
Searle's 'institutional facts' (e.g., 'This is a promise') are descriptive yet carry inherent normative force by constituting obligations.
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2.
If descriptive statements about institutional facts logically entail obligations, then prescriptive conclusions can follow without prescriptive premises.
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Reason for 2 of 2
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1.
Philippa Foot argued that 'rude' and similar thick ethical concepts are descriptive of observable behavior yet logically license prescriptive conclusions.
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2.
If thick evaluative concepts are genuinely descriptive in meaning, Hare's fact-value gap cannot be absolute, undermining the strict is-ought barrier.
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Reasons Against
1 perspective
Reason against
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1.
Descriptive premises state only what is the case
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2.
A prescriptive conclusion cannot logically follow from purely descriptive premises
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