I can't remember- what did Stephen Hawking say about AI ? I believe AI will open up many doors and will be used for the good. However, AI is in the control of human beings many of whom are nefarious and actually evil. AI is already being adapted to warfare. It's no big stretch to see it used to limit the freedoms of the people in states like China & Iran & despotic regimes. The future will not be all rosey. Look at all of human history- that is our future.