But if they haven't really fucked real kids, you can't lock them away just because they might. When you were in school, didn't you ever fantasize about, say, burning down the place? You'd never do it, you didn't really want to do it in real life (something that post-Columbine no one understands anymore), you just occasionally wanted it all to go. You can do something constantly in your fantasy life and never do it in real life, and I'd argue that it's far more common than not for it only to happen in the fantasy world.