The actual Red Light District is highly regulated and is not sex trafficking or sexual abuse. Sex work is legitimate work in an environment where it is not underground and illegal.
I have yet to see the context of this scare zone-- are the sex workers the victims or the perpetrators (werewolves, vampires, etc)? Either way, once again this is an event for mature audiences, just like an R rated movie there can be things that are challenging or disturbing.