If I remember from my trip to Woking the front of the SLR is designed to crumple at different speeds, what compresses and absorbs energy at 60kph will compress and go solid and not absorb energy at 150kph for example and we want compressability to absorb the energy to stop it being passed onto us, the humans, so the front structure has different strength weak points (bear with me) which are designed to shear and deform and different speeds, had the same thing with something I am designing here, I can make something that can let the human survive a 50mph accident but at 100/150/200mph all that stuff becomes useless and I need different levels of crash absorbing in the front structure, you need differing levels of strength structure to survive different accidents,
but bill you are right, the car may have survived the accident but the human wont, my brother is a ski instructor, he had to go and pick up a guys head as he hit a Y shaped tree, the body stopped, the head didnt, the momentum was too great for the neck, which is the same problem you will have hitting a wall at high speed in just about any road car, then things like HANS devices start to make a great deal of sense, hitting solid non moveable objects at really high speeds things like spleens and bladders come off their mountings, the body kinda turns into a bag organs and it all gets a bit ugly