I am most pleased the discussion has turned to pilots and pilotage.
Absent an offense by Aliens, 447 was lost due to fully understandable events. I venture to say the answers have been broached here, and most likely with great repetition. Dollars to dimes it involved more than a mere hiccup. Human error. Mechanical?? Who built what?? Marc DuBois. Captain DuBois. He and two brothers bear the brunt of suspicion, for that is the way. I doubt he would have it any other way. The only thing certain before the Alucia begins, is that there lurks in aviation a virtual certainty that there will be Death. It is a Human endeavour, Flight.