Hijacker in cabin shoots the inside of the plane to depressurize it. Pilot has to dive to rapidly equalize pressure. Door unlocks and the plane is hijacked at gunpoint.
This is but one of myriad scenarios. "Why not just X" ignores the amount of thought that has to go into security design on aircraft.
This is but one of myriad scenarios. "Why not just X" ignores the amount of thought that has to go into security design on aircraft.