The choice of hitting the wall or not isn't a part of the simplistic equation presented to the poster who thinks that speed does not kill.
Well, technically, it's not the speed in and of itself that kills, but the rapid change in speed that occurs when the car and wall make contact. The greater the change in speed at impact, the greater the likelihood of death. After all, commercial airliners travel in excess of 500 mph, and the Apollo spacecraft traveled at around 25,000 mph as it hurled towards the moon. Of course, if either hits the proverbial immovable object at those speeds, death for the occupants would seem imminent.
Speed absolutely doesn’t kill, force does.