"Have you considered turning yourself in?" you say. "You'll probably be better off in the care of Stormwind than you are now with what you're doing." The thug doesn't look fully convinced. "You're sure?" he says. "What do you know about this?"
Tell him that you know Stormwind doesn't abuse people. It doesn't matter whether you have any experience with this if it needs to be said. Just repeat what you said before. That's all you need.