I think you could make an argument for a 'war on paedos' (for example) being as useful as the war on drugs, crime, terror, or whatever.
The difference with this one is that you can conduct your 'business' entirely online, with almost complete anonymity. And what liberal solution is there that doesn't involve children or agitating the mob?
Technology is definitely the wrong thing to look at, I agree. I think, historically, it would be like blaming speakeasies for allowing people to drink illegal booze.