Every year man keeps making more and more foolproof things.
Every year nature keeps making bigger and better fools.
Never underestimate a human's ability to totally **** up in a way thought to be basically impossible.
That said, we still don't know if inadvertent raising of the flaps is the cause, but given human nature, it can't be ruled out.
The FDR and CVR should be able to confirm or eliminate a good amount of the human error possibilities once analyzed.
"If you will not fight for right when you can easily win without blood shed; if you will not fight when your victory is sure and not too costly; you may come to the moment when you will have to fight with all the odds against you and only a precarious chance of survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves." - Sir Winston Churchill