Artificial Intelligence (AI). A Threat to Humanity?

The issue reminds me of the horror comics I read as a child. In one story, a mega-computer, which filled a room, had just taken over the world but was defeated when a janitor accidentally pulled out the plug while she was trying to clean behind it.  Another story depicted a future crime-free world in which a man was arrested and banished to an outer galaxy just for thinking about stealing a pile of money left on a table. How scary is that?