[quote=flu]You do realize a good number of prostitutes these days were forced into a slave trade.,, particularly some from Asia.. a lot of them are forced[/quote] So, if bank robbers use cars to get away, should we outlaw cars? Two points to consider here:
(1) The slave trade is the problem and the criminal activity, not prostitution per se.
(2) The fact that prostitution has been made artificially illegal actually contributes to the existence of the slave trade.

Like bank robberies, we could think of countless examples. Drunk drivers can injure and kill innocents. Then, do we outlaw alcohol? No, b/c drinking alcohol is not criminal. Driving drunk is criminal.