If it were me I would tell the court not just for revenge but because I have heard that rape cases often are not followed though to conviction often enough. (I can undertand why, shame family pressure, his-word-against-hers etc)I would hope I was strong enough to at least try to overcome these. I would like to feel like I am helping the current victim get her justice. If this rapist has commited another crime he needs to be stopped of he may do it a third, fourth fith time.