I'm going to guess the effect would be marginal :)
If you want to address violence it would be better to focus on reducing poverty, on education, and on rehabilitation. A lot of violence is drug related, providing a legal market for buying and selling illegal drugs would kill that element crime. Prohibition of drugs seems to be playing out the same that prohibition of alcohol did. Those who do not know their history are doomed to repeat it.
Normalizing prostitution is not likely to move the needle for the reasons I mentioned.
If you want to address violence it would be better to focus on reducing poverty, on education, and on rehabilitation. A lot of violence is drug related, providing a legal market for buying and selling illegal drugs would kill that element crime. Prohibition of drugs seems to be playing out the same that prohibition of alcohol did. Those who do not know their history are doomed to repeat it.
Normalizing prostitution is not likely to move the needle for the reasons I mentioned.