They can't even get unmanned trains (I mean 'trains', not little transit cars) working properly and reliably. There is not even a machine that can vacuum my floor satisfactorily, or even collect up the washing up and clean it. I shouldn't worry. Give it another generation, not this one. Humans may be subject to 'human error' occasionally, but they can also rescue a situation that no robot brain could solve. this generation is not yet ready to trust its precious existence to computers. It's a comin' (but not for quite a long while yet!)!