Reality is scarier than any movie. Even worse than ghosts or vampires is the fact that horrible things can happen for no reason. Real life, unlike fiction, doesn't have to make sense -- so often it just doesn't. Sometimes there are no answers, and we never learn who committed a monstrosity, or why. All these are examples of just that -- awful crimes that resisted every attempt to crack them, and we can only look at them and wonder who could ever do something like that.
Source: Entertainment Weekly
Source: True Crime Society