Bit harsh Stick, IMHO, yes he made a gross error, but reportedly got on to D&D as soon as he realised he was lost. Requires sympathy and further training rather than kicking IMHO.
As to the original posters question wondering what we can do about it,
I would say a far better safety case could be made for mandatory GPS with airspace warnings than a Mode S txp.
(Cue arguments about heads in cockpits missing visual nav clues, despite reported stude mis-identifying many on subject flight
)