Machines that think, can learn from their experiences, can make their own decisions. However, humans still responsible for what these machines had done. I have a car that can semi-autonomous, it can keep itself in lane, keeps preset distance from car in front, and some other functions. All these functions help me a lot while driving, but some people think they can drive better without these functions, so turn them off or using them incorrectly, these are human errors. Or some functions are not worked as designed, wrongly designed, these are also human errors, but on manufacturers. Humans who designed and master thinking machines should be responsible for what these machines have done.
