The history of censorship shows us the folly of this approach, which is why the metaphor of sunlight being the best disinfectant is so commonly heard. Milton envisaged this as a battlefield, with Truth and Falsehood as the antagonists. ‘Let her and Falsehood grapple; who ever knew Truth put to the worse, in a free and open encounter?’ We are far better placed to know and overcome evil if we are acquainted with its essence, and the best way to achieve this is to listen and to read.

