Lets face it neither humans nor machines function perfectly all the time.
Humans doing repetitive tasks sometimes "see" what they are accustomed to seeing, or are expecting to see, especially if momentarily distracted.
That is why most airplane systems and procedures have warning system and cross-check redundancy. TOWS, and challenge and response, for instance.
If machines could be trusted to fly aircraft without human back-up, the economic and and efficiency benefits would have had them doing so from long ago. So we have to put up with pilots.version 001.
Years ago at a Royal Aeronautical Society Air transport course I attended, there was a very informative lecture by a gentleman from the AAIB in which he demonstrated how easily a human mind can be programmed to commit stupid errors, and misread simple indications. Layouts, language, and a host of other small details can set traps that even the most experienced and qualified pilots fall into.
Human engineering is still in its infancy, but hopefully that will change soon.
The closest example of a perfect human died a couple thousand years ago, although we do have a few pretenders on this forum.
