GPWS was introduced to try and prevent idiots killing themselves -
You cannot prevent idiots killing themselves and their companions. There have been cases where two crew aircraft have flown into the ground with the GPWS screaming "PULL UP!!!" and the crew shouting "SHUT-UP!!"
particularly in 2-person flight decks with some wet-behind-the-ears sprog in the RHS.
No. The accidents that led up to its introduction all occurred on three-crew aircraft. GPWS has probably been the most useful innovation in avionics during my 46 years as an avionics engineer.