See above.
Ah well then you must blame Boeing for making the 767 and 757.
They bear some responsibility as does the airline industry.
However, a great deal of blame also falls on our society for encouraging citizens to play nice and just give in to the demands of criminals. We are told it's wrong to use a gun to defend ourselves and just to let the criminal steal what he needs. We are told not to fight but just to give in and let hostages seize control of a building, plane, etc.
That must change.