Quoting the SMH quoting JSM
he who, of his own free will, on a half a pint of sherry, was particularly ill:
We should remember John Stuart Mill's famous justification of the importance of the "marketplace of ideas". People should be given the chance to hear, and understand, even the most disagreeable opinion, because, "If the opinion is right, they are deprived of the opportunity of exchanging error for truth; if wrong, they lose what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error."
From Amy Corderoy's column