Excellent story, and reinforces my policy of avoiding Airbuses whenever possible. The Airbus flight control system is snarkily described by Boeing pilots as being designed to protect the airplane from the pilot. AF447 is another one to look into if you're interested in these things; the report on that describes what people in the Boeing camp regard as godawful ergonomics -- but to be honest, Airbus pilots love and defend the things, so there you are.
As I used to teach my students, real-time control systems either go down sane (orderly shutdown), go down dead (power failure) or go down crazy. This one went down crazy. Or as John Gall wrote in his classic book "Systemantics," "Fail safe systems fail by failing to fail safe."