To play devil’s advocate, these are not necessarily my views, there are arguments out there that drug use an prostitution are not victimless crimes.
Looking at drugs first, there’s other costs associated with drug use besides some guy just sitting around stoned eating Chees in his apartment. For instance, if someone decides to do hard drugs, several of them have major negative mental and physical side-effects that then a drain on those support systems. For many drug users, it potentially makes them less functional members of society than if they were not drug users. Worse, for thos get addicted to hard and expensive drugs, they may result to theft and violence to maintain their habits. To some extent, the idea that, even if one doesn’t have kids, we all still benefit from public schools, the idea that we all benefit from having heathy, productive, law abiding citizens could be an argument that the victim isn’t a given person or persons, as it might in many other crimes, but it’s society as a whole.
Obviously, there’s counter-arguments to this, such that there’s a big difference between someone smoking pot occassionally, and a hardcore heroin or meth addict, and maybe a better line could be drawn, or maybe we just find ways to minimize the social impact of people who choose to engage in those activities. To some extent, we already do, maybe that’s enough or maybe we could do more.
And as far as prostitution, it’s a bit different. In theory, a woman choosing to sell her body with coercion isn’t being victimized, but in a lot of cases there is coercion. There’s also issues of violence, disease, which obviously don’t do them, their clients, or society as a who any good. And, of course, for women that have fallen into that life for whatever reason will have difficulty getting out because of money, coercion, or drugs.
The arguments for this, of course, could be that if it were legalized, maybe we could have some amount of oversight in place to protect women who may actually choose that life style, keep them from getting coerced, and all of that. Or, at the very least, not force them into the black market.
Personally, I would tend to believe that the laws regarding drug use and prostitution need a lot of work and should be more liberal, but I also feel that it’s a bit misleading to call them victimless crimes, at least as they are now, because I believe that if they were legal, we could probably do more to limit the impact on society of these choices.