For those who don't choose to obey this fundamental agreement, there are police, courts, and jails. When laws are irrational, however, people are less likely to sacrifice in order to obey them. What I'd like to see police do is deal with important issues and not these sorts of victimless crimes when society is riddled with problems. We hear more about crimes with genuine victims because these crimes tend to get reported. Except for some busybodies, do-gooders, and police entrappers, no one's going to report a consensual crime.
People take part in consensual crimes because the activities are appealing.
A person discovers that he or she has broken the law, had a good time doing it, and reaped few, if any, negative consequences. This positive reinforcement makes it easy to commit the consensual crime again. Other consensual crimes are tried. Although not yet caught, the person is, nonetheless, living outside the law and a criminal many times over. Our leaders certainly seem more concerned about these than, say, shoplifting, insurance fraud, stealing from work, or other crimes with genuine victims.