How do you feel about computers deciding who lives and dies?
The phone record analysis of who called who's cell phone in Afghanistan could convince a computer to drop a bomb on you or your wedding party with the approval of a human. I hear they don't know much more than what the cell phone was doing, and the ever watchful computer does most of the analysis on it's own.
It's a great thing smart men like Elon Musk have put their own money and time into things like the Future of Life Institute and OpenAI to increase the chances that machines have good morals and ethics and are hopefully less likely to see us as enemies.
There's the funny story of the paperclip maximizer. A machine doesn't need to be evil, or dislike you at all, but still cause your extinction. Imagine a poorly designed, but quite powerful machine, which is programmed to maximize the number of paperclips in the world.
It discovers that many atoms that could make good paperclips, are trapped in human bodies, and that the humans have to die in order to become what it thinks is the best thing in the world..paperclips.