John Stuart Mill On Censorship

The peculiar evil of silencing the expression of opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. 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.

–John Stuart Mill, On Liberty, 1859

Hannah Arendt on Choosing Between The Lesser of Two Evils

If you are confronted with two evils, thus the argument runs, it is your duty to opt for the lesser one . . . the weakness of the argument has always been that those who choose the lesser evil forget very quickly that they chose evil.

–Hannah Arendt, Responsibility Under A Dictatorship, 1964.