I guess I did misunderstand you then. You're right. A rapist won't probably need this app. All I was trying to say is that leaving the rapist issue aside, this app is misusing unsuspecting people's privacy and personal info.
Just because the data is publicly available, it does not warrant such misuse.
As for the nerd basher, I would expect the same treatment.
It is not about the app, but the criminal. It is about accepting responsibility for ones actions.
And yes, I would say they have every right to make a nerd basher app, if they want to (although I guess they are less likely to have open facebook profiles).