The idea is that if sex workers don’t fear arrest, they’ll be able to access healthcare and other services. One 2014 study from The Lancet found that decriminalizing sex work could “have the largest effect on the course of the H.I.V. epidemic.”
Proponents also say that legalizing prostitution would make it easier for workers to inform authorities when they observe instances of sex trafficking, defined as coercive sex work or that involving minors.
I don’t agree with the socialist angle they’re supporting, but I of course appreciate the movement against sexism and for equality.