[potato3732842]

The zone's #1 job is to buy enough time for the airbags to inflate during a crash at speed. Occupants moving forward toward the space the airbags will occupy as the vehicle stops and then being hit by an airbag attempting to occupy that space would be bad.

The degree to which crumple zones attenuate forces felt in a crash is fairly minimal in low speed crashes because in order to have enough time for airbags to inflate in a 100+mph crash they are necessarily quite stiff.