BOAC:
You are all most welcome on the thread I began in 2009
Computers in the cockpit and the safety of aviation which covers these very dilemmas, and since July 2009 we have seen many unfortunate examples of either over-reliance on automation or lack of understanding of it.
I will post a link to my 1996 article on Cali and related issues as well as the NTSB ATC chairman's factual report. Colombia went way beyond ICAO convention by making the NTSB a partner in the investigation. The Colombian in charge of aviation matters at the time was super sharp, as are many of the aviation "wheels" in Latin America.