Every law is underwritten by the potential use of force by agents of the state. Sometimes you have to go through several laws to see that (you ignore liability -> you get sued -> you ignore lawsuit -> you lose -> you are ordered to pay -> you ignore payment -> (if you have money in bank, it is taken from you; go to beginning of loop, this time with respect to bank | if you don't have money in bank, but do have money and spend it, you'll be eventually likely be arrested for contempt of court, but an agent of state applying force)

Law without an underwriting by law enforcement is not more than convention.