Because the regulation is crappy. Current regulation and laws is what made them dangerous.
> Both have high degree's of human trafficking
Again. This is due to the current laws. If woman were able to travel to another country (say, USA) and do short-term entertainment work for a few months on her own terms, you will reduce human trafficking.
The current laws benefit lots of people. For politicians, this problem doesn't exist since prostitution is illegal. For human traffickers and clubs, this brings them money because if woman were to operate legally on a freelance basis, they'll have no business mode. The customers don't really care.