At the final analysis....I have the absolute requirement to ensure the aircraft is flown within the Tolerances required to accomplish a safe approach and landing. Amongst those duties is to monitor the flight path and all the instrument indications to confirm the correct flight path is being flown.
Automation, no automation, hand flown, flown by the other Pilot, no matter.....the PIC and in a Crew Served aircraft.....all Flight Crew Members share that responsibility but the final ultimate responsibility lies with the PIC.
We can discuss all the issues we wish....but in the end....prepared, trained, tired, sleepy, bored, sick, or not.....the occupants of the cockpit seats must perform.
A Non-Precision Approach to an Airport in day light in benign conditions in a completely airworthy aircraft should never wind up in a fatal crash of the aircraft due loss of control.
That this one did....is what gives rise this many paged discussion we are having.