I realized that my previous response didn't really convey what I wanted to, so I'll try again: There is always a possibility that sensors will fail. Unless yo

I realized that my previous response didn't really convey what I wanted to, so I'll try again: There is always a possibility that sensors will fail. Unless you have enough redundancy in your sensors to employ a voting system (not always practical, sometimes not even possible), computers are still no good at handling such failures. A properly trained human has a pretty good chance of maintaining SA when sensors fail. A computer, not so much. In fact, given the definition of SA, I'm not entirely convinced that any computer currently in existences is truly capable of having SA at all (which is what I was trying to get at in my previous reply).