Crime, and prison, is a racket. It's not for punishment or justice, it's sole purpose is monetizing unsavory acts and reaping the rewards from the corrupt power. Like people have said already, making something illegal doesn't make something go away. In fact, it's usually quite the opposite, because all human beings are nothing more than brats, they will do whatever it is you tell them not to.
People by their nature will want to stop someone from doing an "unlawful" act. Thing is, we live in a time where we are told not to be responsible for ourselves and to allow a paramilitary force to usurp that spirit from us. It's been like this for as long as our closest generations can recall, so we don't know how to do it anymore. Instead of being just in any sense of the term, people in uniform come by and put the criminal through the for-profit prison system rigmarole instead.. well, at least in America.
We don't need more laws, it's redundant. Maybe a law to prevent the inception and execution of other laws after it.