It's got control of the trim wheels, and it's plunging the aircraft to the ground with nonsense trim settings. Right? Needing to consult the manual to disable

It's got control of the trim wheels, and it's plunging the aircraft to the ground with nonsense trim settings. Right? Needing to consult the manual to disable that input is eh... not optimal. They physically could not trim the aircraft, and even worse (as if), could not -trivially- prevent changes to that trim. Should humans on the line have ultimate control of the surfaces or not? If so, how many steps through "complicated checklists" should be required to get control of a basic setting like trim? The base issue is that it was even possible for the control of humans with hundreds of lives in their hands to be overridden by a set of predefined instructions.