Not sure if thats what you meant, but yeah, cars used to be made "stronger", until it was realised that they are more fatal that way. Theres a reason most modern cars crumble up quickly in an accident, and that is because the crumbling absorbs energy from the impact, helping the vehicle slow down and stop without damaging the passenger. If the car didnt crumble, the energy has to go somewhere else - this could go to the passenger, flinging them through their window.