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Hume's fork is the idea that all items of knowledge are based either on logic and definitions, or else on observation. If the is–ought problem holds, then "ought" statements do not seem to be known in either of these two ways, and it would seem that there can be no moral knowledge. Moral skepticism and non-cognitivism work with such conclusions.
For example, an invalid inference "Because everybody ought to be equal, there are no innate genetic differences between people" is an instance of the moralistic fallacy. Where the naturalistic fallacy attempts to move from an "is" to an "ought" statement, the moralistic fallacy attempts to move from an "ought" to an "is" statement.
The term naturalistic fallacy is sometimes used to label the problematic inference of an ought from an is (the is–ought problem). [3] Michael Ridge relevantly elaborates that "[t]he intuitive idea is that evaluative conclusions require at least one evaluative premise—purely factual premises about the naturalistic features of things do not entail or even support evaluative conclusions."
Moralistic fallacy – inferring factual conclusions from evaluative premises in violation of fact–value distinction (e.g.: inferring is from ought). Moralistic fallacy is the inverse of naturalistic fallacy.
The problem in philosophy of moving from an "is" to an "ought" (the "Is-ought problem") is said to have been introduced into philosophy by David Hume. Richmond Campbell, in discussing this, asks how one might move from a knowledge of what exists, i.e. from a whole range of possible values, to a knowledge of which, among these, one ought to ...
They further argue that political fact-checking focuses exclusively on describing facts over making moral judgments (ex., the is–ought problem), assert that it relies on public reason to attempt to discredit public figures, and question its effectiveness on conspiracy theories or fascism. [108]
From the surprising resurrection of the skinny jean to bag charms and donning pajamas in the day, here’s what experts believe you’ll add to your closet next year.
ought – the "is" and "ought" problem involves terms that go back to Kant, Hume, and others. Kelsen preferred the ought (Sollen) or an ought proposition (Sollsatz) to norm because of the latter's dual sense of both descriptive (e.g., some behavior "is the norm", which Kelsen does not use) and prescriptive social norms. [7]