One issue is that imperfect enforcement is often how the momentum to change the law is created.
If the police had been able to swoop in and arrest the "perpetrators" every time two men kissed, homosexuality would have never been legalized; If they had been able to arrest anyone who made alcohol, prohibition wouldn't have ended; if they had been able to arrest anyone with a cannabis seedling, we wouldn't have cannabis legalization.
If the police had been able to swoop in and arrest the "perpetrators" every time two men kissed, homosexuality would have never been legalized; If they had been able to arrest anyone who made alcohol, prohibition wouldn't have ended; if they had been able to arrest anyone with a cannabis seedling, we wouldn't have cannabis legalization.