Investigators are pursuing a theory that excessive air speed -- potentially spurred by ice building up on electronic airspeed sensors
Speaking as someone who has flown in severe icing conditions, if this was possible on the Airbus (and I still find it total unbelievable!) then it should never have been certified for flight in icing conditions.
If this is the best theory that BEA can come up with then I fully understand why people are already questioning their ability to solve this accident and their neutrality.