Ok, since you seem knowledgeable about this. What's to prevent them from doing all this anonymously? If they can keep their mouth shut and do all there enterring through a library computer or some other more or less public terminal...would it ever have been traced back to them?
Nothing. It's similar to one murderer doing a really "good" job and leaving no traceable evidence and another doing a really messy job and leaving his DNA and finger prints all over the crime scene. These two nitwits did a really messy job and got caught.