I don't go with any of this. I think the crew were perfectly competent professional pilots who were wide awake and landing at an airport they knew well, warts and all. I think there was a software or hardware error that caused the plane to fly itself into the ground while the crew did all they could to disengage and take over control.
To think thus is to hope that the cause will be found and remedied, making future flights safer. To blame the crew for being fatigued, complacent or whatever is to say this is an event that is probably going to recur over and over again and is real scary to the any prospective customer reading this thread.