The concept is one of the main concerns of Transcendence in general. Imagine if Hitler's mind had been uploaded into a computer... It can be perceived that he was a sick man for the sorts of things he believed and if he'd been placed into a machine the question would have been if that sickness would have persisted. It's an argument I had at a Transhumanist talk in 2011, where someone was talking on the subject of the dangers of Artificial Intelligence Sentience. My point was "I fear the psychology of men more than the sentiency of a machine" mainly for the pretense that we can be sick, we can be deluded and we most definitely can be egocentric, and all of that isn't even breaking a program since we weren't running one to begin with.
Actually even in the case of transcendence as portrayed in the movie, without the Internet what could it possibly amount to? Nothing says you have to plug the machine into the Internet. A stand alone machine wouldn't be able to do much no mater how intelligent it was.
Also, I agree with you about humans being far more dangerous than the machines will ever be.