The problem with this is that for LE, its a lossing battle. If it's not CL, it's backpage, if it's not backpage, it's duttslist, and it just goes on from there. These things are always going to be about supply and demand. Where there is demand and money to be made, someone will supply it.
Not saying LE should just throw their hands in the air. They have to proctect what's ethical and what's in society's best interest. Like I said though, it's a lossing battle.