I agree with your analogy to weed and alcohol. To a certain extent, I believe this kind of idea should be extended to prostitution too. Not that I support it or anything, but think about it... if prostitution were to be legalized, then the government could regulate it. Pimps and escort agencies would all have to own a prostitution license, or they would be thrown in jail. Using underage girls would be outright illegal, any acts of violence or abuse would revoke the pimp's license and/or get them put into jail... You could even have a hooker's union, that would find it's members good, reputable agencies to work for.When you really look at it, the government has a lot more control over legalized, regulated substances than ones it outright deems illegal.
This, I think, is another aspect of the desirability of free choice on the abortion issue...
-FFox
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"A christian, an anarchist-slash-prostitute, figures out the true meaning of freedom. Not freedom like America, freedom like a shopping cart."
-NOFX