 Is harm necessary to justify regulation? Though some of Mill’s pronouncements suggest that causing harm is a necessary condition of restricting liberty, closer inspection suggests that Mill countenances various restrictions on individual liberty that appear designed to benefit others, rather than prevent harm. Let’s focus on two main kinds of apparent exceptions to the necessity thesis: (1) enforceable duties to others that benefit them, such as the duty to give evidence in court and Good Samaritan duties (I 11) and (2) enforceable duties to contribute one’s fair share to the provision of various kinds of public goods (IV 3), including the common defense (OL I 11; PPE V.viii.1), community infrastructure (PPE V.viii.1; CRG 538, 541), mandatory education (OL V 12–14; PPE II.xiii.3, V.xi.8; CRG 467–70), and state support for the arts (PPE V.xi.15). These two sorts of exception present somewhat different issues.