Abstract

I apply Karl Popper’s conception of critical rationality to the question of personal fulfilment. I show that such fulfilment normally depends upon the person achieving positive freedom, and that positive freedom requires negative freedom, including freedom of expression. If the state has legitimacy, its central duty must be the enforcement of those rules that provide the best prospects for personal fulfilment for the people under its jurisdiction. The state is therefore morally debarred from suppressing freedom of expression. I consider and rebut arguments from falsity, harm, offence, and democratic principles, which are intended to show that the state should prohibit the expression of some types of content. I go on to argue that typical university speech codes are incompatible with the aims of an institution of higher education.