If I must wear a helmet (and buckle up) for ???safety,??? because I ???might??? get hurt ??? and (per collectivist premise) impose ???costs on society??? then surely it is only a matter of time before such things as whether I exercise sufficiently, what I eat (and how much), my sexual activities, my hobbies ??? even my thoughts ??? become a matter of ???the commons,??? all enforceable at gunpoint.