How worried should we be about evil A.I. and killer robots?

How worried should we be about evil A.I. and killer robots?
Keep reading and then you decide:

Bill Gates thinks we should be very worried, saying “I agree with Elon Musk and some others on this and don’t understand why some people are not concerned.”

Elon Musk tweeted “We need to be super careful with AI. Potentially more dangerous than nukes.” On Friday he took another step in the shoes of Iron Man’s Tony Stark (which is already loosely based on him) to fight tomorrow’s evils. He launched Open...