Paternalism is a frequent source of anxiety and scholarly enquiry within public health. This article examines debate in the UK from the 1950s to the early 1980s about two quintessentially paternalistic laws: those making it compulsory to use a motorcycle helmet, and a car seatbelt. This kind of historical analysis, looking at change over time and the circumstances that prevent or enable such change, draws attention to two significant features: the contingent nature of that which is perceived as paternalistic and therefore objectionable, and the wide range of arguments that can be marshalled for and against. It suggests that paternalism became a particularly disruptive accusation in the UK of the 1970s in relation to seatbelts, thanks to the population that would be affected and the wider socio-political context. It also suggests that arguments about the social cost of death and injury on the roads, along with overt acceptance that some element of paternalism could be acceptable, proved influential—as was the sense of inevitability that 10 years of regular debate helped to create.