There is little to compare an aircraft with a car, its like apples and oranges. The risk in a car is much higher with other cars going the opposite way just a few feet away and if you stray off track by more than a few feet and you will crash into a barrier or building.
The problem with ballistic chutes and airbags is the risk of accidental activation.
The only real use I can see for a ballistic chute is mid air or structural failure. Both are very rare occurences that probably would compromise the airframe to a point where it wouldn't withstand the forces generated by the chute deployment.
Likewise airbags, if it was faces hitting control yokes that was killing pilots I would agree, but I think you will find it is general impact forces and fire that is the big threat.