The dark side of technology: The World Economic Forum's 2017 report on AI

'Some of AlphaGo's moves puzzled observers, because they did not fit usual human patterns of play. DeepMind CEO Demis Hassabis explained the reason for this difference as follows: "unlike humans, the AlphaGo program aims to maximize the probability of winning rather than optimising margins". If this binary logic – in which the only thing that matters is winning while the margin of victory is irrelevant – were built into an autonomous weapons system, it would lead to the violation of the principle of proportionality, because the algorithm would see no difference between victories that required it to kill one adversary or 1,000.'