Don't those stats only prove that criminalized prostitution is a negative? I expect you'd have a huge differential if you took similar stats from people selling weed in a place that strictly enforces a ban vs a place where it is legal and regulated. Probably not when it comes to rape, but violent/armed encounters are probably negligible for a legal weed shop, but common in an underground industry. Naturally, in the latter case, people would overwhelmingly want to get out, not because of the job itself, but the opportunists that crop up due to the lack of legal oversight.