Banning prostitution and/or paying for sex has never worked in human history, and it's likely it never will.
Regardless of how you feel about the morals of sex work, surely any rational and compassionate person will see the truth in that above statement, and thus seek to ensure that the sex work that inevitably does happen should be done in the safest way that we can.
That is not achievable under blanket ban situations like this, IMO. It's just creating a dodgy black market.
Again, there's no use pretending we can just ban it and expect no sex to occur. That's just not a realistic expectation.