What makes you think the pilot was controlling the aircraft? Airbus has a TMR computer system controlling it and false airspeed and/or pressure data could have given the system a nervous breakdown, as apparently happened to another Airbus off Brazil.
I made no claim the pilot was manually controlling the airplane. Regardless, if the crash was caused by faulty instrumentation, systems or pilot input, he is ultimately in charge of controlling or correctly interpreting these things. Failure to do so and losing your plane defines pilot error.