An argumentum ad populum is a fallacious argument which
concludes that a proposition is true because many people believe
it.
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The rhetorical device that attempts to justify an action based
on popular belief or participation is an argumentum ad populum.
Argumentum ad populum is a logical fallacy, because popular opinion
can often be wrong.
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Appeal to the crowd what should we use has a school crest. Then
the crowd votes and majority wins
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That would be called a "red herring" fallacy, an informal fallacy known as argumentum ad populum.
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An argumentum ad verecundiam is an argument from authority, or
an appeal to authority.