In my neighborhood, the most effective way of ridding the streets of prostitutes was to start 'naming the Johns.' We took photos and wrote down license plate numbers. The prostitutes soon moved their business elsewhere.
If brothels were esablished, at least the prostitutes would have protection. This will not, however, eliminate the lucrative street business of turning tricks for violent men. Most of those prostitutes subject themselves to violence because they are drug addicted. We need to provide the drugs so that we can end the cycle of violence.
Drug addiction can be treated as a medical condition. Why isn't this being done? Because its the most profitable business in the blackmarket (think prohibition) and because, once again, we are blaming the victim. Treating drug addiction would be the most effective way of decreasing violence in our society.
If the U.S. really wanted to win the war on drugs, they would stop trying to bust the users (pointless), the pushers (new ones are ready to take their place) and stop destroying the crops in Afghanistan and elsewhere. We only prolong the war and turn farmers toward the Taliban and other war lords for protection of their livelihood. Instead of being seen as 'the enemy', we can end the production of heroin by providing medical care and destroying the market. The industry would soon dry up.