give investigation a chance
This unfortunate accident will have detailed FDR/CVR data, that can tell the story, for others to learn from (hopefully). I agree with other inputs, that this site is not the right place for random speculation on how and why. The accident investigation branch will most probably come up with the answers that many are asking for.
I have a problem with the fact that we, the cockpit crew, accout for more than 70% of the actual or probable cause to day.