There was a proposal here in SJ (Saint John, New Brunsick, Canada) recently that the 'johns' caught with prostitutes should have their vehicles confiscated. Much like when you are caught fishing 'out of season'. Great idea I and many of the citizens here thought. But, no it wasn't accepted due to violation of rights or whatever.
Most prostitutes are out on the streets solicitating themselves to feed a drug habit. They have not chosen this way of life as profession. Legalizing prostitution would eiminate this. These girls are victims of a society that has deeper problems.