I'm not going to argue against the facts, but I will argue that the results for victims are different. If a victim of sex trafficking is caught on the street when prostitution is illegal they're now a criminal and will probably be dealt with as such by police looking for easy numbers.

When they haven't committed a crime they should be able to get aid from the authorities and their pimps and traffickers arrested.

Unfortunately this isn't a perfect world and resources aren't always available for whatever reason. I don't like it, but I also don't like creating criminals out of victims.