That's not my own conclusion; it's the conclusion of computer scientist Steve Omohundro, author of a new paper published in the Journal of Experimental & Theoretical Artificial Intelligence.

His paper, entitled Autonomous technology and the greater human good, opens with this ominous warning (1)

Military and economic pressures are driving the rapid development of autonomous systems. We show that these systems are likely to behave in anti-social and harmful ways unless they are very carefully designed.