The limits on freedom of expression are tested in our democracy when we have to deal with hate speech. A thinker who faced the problem of those limitations was John Stuart Mill, who formulated what has been called “harm principle” in his On Liberty (1859), and according to which the only good reason to interfere with an individual’s liberty is to prevent harm to others. On these grounds, several authors have tried to reconstruct the category of “offense”, in order to (...) forbid varieties of conduct even though they do not cause harm to others. However On Liberty is a remarkable work in defense of liberty, even for those who want to refine their premises introducing elements that justify restrictions on freedom of expression. Certainly the weakness of Mill’s thought, at least one that help us to draw lessons for our democracies, appears only when we notice its flaws in light of a joint reading of On Liberty and Considerations On Representative Government (1861). This task points out an unjustified split between free speech and political participation rights, and one that would exclude certain individuals from citizenship indeed. (shrink)