“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 the truth, produced by its collision with error.”John Stuart Mill · Despre libertate · 1859 · Capitolul 2
Silencing an opinion always costs something, even when the opinion is false.
Mill shows that censorship is a loss in both cases. If the silenced opinion was true, humanity remains in error with no chance of correction. If it was false, we still lose something precious: a truth that is challenged and defended becomes alive, understood, and lived, while an untested truth decays into dead dogma. A community that bans a mistaken theory about health prevents not only harm but also the chance to show publicly why it is wrong.
Why it matters Relevant to debates about censorship, online platforms, and academic freedom: forced silence costs us even when it is justified.