It would seem to this lowly PP that the simple solution to the "FLCH trap" is the LOTW manuever or simply follow the FTDA procedure.
That an entire flight deck was unable to Look Out The Window and/or simply Fly The Damn Aircraft remains to this day ... incredible.
This is not an "error", nor a "mistake" ... it is not "accidental" ... nore even simple inattaention ... t is an outright, abject, and in my opinion criminal, failure.
If you lose control of your car and kill someone you are charged with criminal vehicular homicide or a myriad variations of that.
This failure in my opinion was no different. In fact it was worse, far worse.