Erm, 447 was brought down by the idiot pilot. Yes, the pitot tubes froze, but idiot kept pulling back on the stick for no apparent reason and the plane stalled.
It was a combination of system failure and the pilot being unable to deal with it. The "idiot pilot" had no chance -- neither the flight-control computer nor the pilot were receiving Airspeed information critical to the ability to fly the plane, and the computer had already had a nervous breakdown.
There was too much $$ involved for Airbus to allow the plane to be blamed.