Thus, Mill recommends that a liberal society support “absolute freedom of opinion and sentiment on all subjects, practical or speculative, scientific, moral, or theological.” This includes supporting the freedom to express all this openly, since a freedom that must be kept secret is no freedom at all. He does note that such expressions may offend sensibilities; it may mean that people will do things that others consider “foolish, perverse, or wrong.” That is not a problem unless it causes real harm to those others. (Of course, defining “harm” is so complicated that we are still arguing about
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