Why is the 'prostitution ads in Craigslist makes policing easier' argument made by everyone but the police themselves? I think people underestimate how much Cr

Why is the 'prostitution ads in Craigslist makes policing easier' argument made by everyone but the police themselves? I think people underestimate how much Craigslist's brand legitimizes prostitution - it's a lot easier to rationalize browsing for hookers when the ads are in the same place you look for apartments and sell your used furniture. Pushing them over to creepy-loser-forums.ws seems like a cheap way to reduce demand.