"Why the .... did the stupid automation silence the stall horn ? "A great question. The systems silenced it because the IAS fell below 60 kts for a time. This caused the FWC (Flight Warning Computer) to silence the STALL warning."
From reading all the various posts, I conclude this is the ultimate cause of the crash because it misled the pilots.
Wouldn't a quick check by the flight computer have shown the plane was not on the runway but in the air? That should have been done.