📝 Editorial Note: This article is part of an ongoing 8-part scholarly series titled “ The System of Reciprocal Duties ” , preceded by an introductory index post. The series explores how rights emerge from and operate through corresponding duties, drawing on Hohfeldian analysis and Kantian legal philosophy. This part examines self-regarding acts in the context of indirect harm , using helmet laws as a case study to analyse how individual autonomy may be limited when personal