The argument from the “marketplace of ideas” model for free speech works only if the underlying disposition of the society is to accept the force of reason over the power of irrational resentments and prejudice. If the society is divided, however, then a demagogic politician can exploit the division by using language to sow fear, accentuate prejudice, and call for revenge against members of hated groups. Attempting to counter such rhetoric with reason is akin to using a pamphlet against a pistol.
