Pimps do aggress agains prostitutes. But it is an off-topic! We consider a case against production, not pimps.

As a side note, let's consider the case, when you go to a prostitute, who is not independent, but works under a pimp. I'll prove you that it is not a bigger thing than going for groceries. Her business is under a racket by the pimp. But any good business can be racketed by criminals. For example, the state is the biggest racketeer. It forces the businesman to accept the fiat currency in exchange of goods and services. Do you commit a bad thing, when you go to grocery store and pay with fiat currency? It is a forced, racketeered enterprise, he would not accept a piece of paper in exchange for goods, if not his pimp (the state).