Dark intentions: should we fear AI with purpose?

It's hard to ignore dystopian pronouncements about how Artificial Intelligence (AI) is going to take over our lives, especially when they come from luminaries in tech. Entrepreneur Elon Musk, for instance, says "If you're not concerned about AI safety, you should be. And IT maven Erik Brnyojolfsson, at MIT, has quoted Vladimir Putin's claim that "The one who be-comes leader in this sphere will be ruler of the world." AI is chalking up victories over human intelligence at an alarming rate. In 2016 AlphaGo, training itself on millions of human moves, beat the world Go champion, Lee Sedol.