The real AI risk isn't an all-powerful savant which misinterprets a command to "make everyone on Earth happy" and destroys the Earth. It's a military AI that correctly interprets a command to kill a particular group of people, so effectively that its masters start thinking about the next group, and the next. It's smart factories that create a vast chasm between a new, tiny Hyperclass and the destitute masses... AI is hardly the only technology powerful enough to turn dangerous people into existential threats. We already have nuclear weapons, which like almost everything else are always getting cheaper to produce. Income inequality is already rising at a breathtaking pace. The internet has given birth to history's most powerful surveillance system and tools of propaganda.