Should we really do it for any reason? Are there not some groups of which a certain level of violence (enforced by the state) is good? I can think of many groups of people who engage in actions which we agree it is good to respond with some violence to enslave them in cages. Well, that is one interpretation of what we do when we put someone in prison, but I think we cannot divorce imprisoning someone or putting other punishments on them that are backed by imprisonment from the threat of violence that is put on prisoners to comply with the rules of imprisonment.
At the core, laws are enforced by violence or threat thereof and are largely based upon subjective morals. Talk about adding laws is thus talk about bringing violence to some group of people. And sometimes (say laws against murderer or theft), it is required for us to have a civilized society.