Why do you suppose ejection seats are not permitted on civilian airplanes?
They would be life-saving, too.

I think I read somewhere that the entire ejection seat assembly
including supports, rails, explosive hatch,
ect weighs about 1,000lb each. Do you want to be a passenger in a
non-ejection seat when the
PIC has one? We would need 4 ejection seats in a 172. Let's see now, 172
usable weight limit
minus 4,000lb is ....

Kind of eats into the gross weight limits of small GA aircraft...