I suspect that most of us are familiar with the phrase "red herring" in the context of books or films, and that we know it best from its second definition, to wit:
2. Something that draws attention away from the central issue.
Not only is this a narrative technique—particularly in mysteries and detective stories,
involving a "false" but distracting clue—it's also a logical fallacy. In Dorothy Sayers' mystery Five Red Herrings, she sets up six suspects; only one is legitimate. The other five are red herrings. Red herring is also used to refer to a logical fallacy, better known to rhetoricians as ignoratio elenchi. It's when someone deliberately attempts to change the subject or divert the argument in a debate. In terms of logic, a red herring functions, as it does in narrative, as a distraction technique.
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