The problem with aircraft automation is that the pilot in command can easily cause a problem by incorrect use of main control panel. Most crashes are probably pilot error using the autopilot systems & checklists. My CFI instructor used to fly 737 & 747 as Captain & once had the female first office reading from the check list say positive rate gear up & the aircraft had not even left the ground never mind 400 foot minimums. Hand god the aircraft weight was still activating the wheel sensors & stopped the wheels from going up. As for aircraft without pilots oh god no, too much to fail & cascade that a good pilot can correct.