Earlier quoted context omitted.
> Not once I heard of a local Dutch girl doing this. How is this relevant? I mean in what manner would nationality change your opinion on this topic?
Most of the time they are exploiting Eastern Europeans from poor countries. Many times they are trafficked by mafia types and have their passports/documents taken away.
National police authorities do extensive research concerning prostitution because it touches key issues of organised crime, in particular illegal prostitution, human trafficking, violence, money laundering etc. The amount of problems they find with window prostitution are relatively small, because they're licensed and under supervision of various authorities. The amount of human trafficking, taking away of passports etc you describe, doesn't happen much at all in the red light district.
It does happen, but not in window prostitution (which has fixed, licensed addresses, which are supervised). Rather it happens in the shadow, i.e. various somewhat secret and temporary networks which offer prostitution services at constantly changing addresses, with front men running the operations. Almost all cases where police finds out about human trafficking, violence, money laundering, underage prostitution etc, is from this underground sector.
I'm not saying the red light district is paradise or that I'd want me or my friends to work there. But it's not really where most of the problems are. When people speak about issues in the Netherlands with respect to prostitution, it's either NIMBYism in the red light district, or the issues with illegal underground prostitution outside of the red light district. People seem to conflate the two in this thread.