Did you know that murder rates increase in proportion to ice cream consumption? I'm not shitting you. Of course, ice cream consumption increases in the summer time. People like to kill more in the warmer months, apparently, so the ice cream consumption is irrelevant. The point: you've got to keep in mind the distinction between cause and correlation. A decrease in deaths with an increase in freeway speed limit has also been explained by a lower proportion of drivers driving recklessly (which is associated with high proportions of drivers knowingly violating the speed limits). Just complicating things for the fun of it.Over here in Michigan and many other states the highway deaths deceased when the freeway speed limits were increased. So this blank statement that speed kills is wrong, its the differences in speeds that are a danger more than speed itself.
A few years back some guy on a race track lost control of his race car and crashed in to a wall at 200 mph. The wall shattered and the guy and even his car were not hurt bad at all. Everybody was saying if his car was going only 100 mph mostly likely the wall would not had shattered and he would have been killed. Going super fast on impact saved his live.
I know that has nothing to do with real world driving on the streets, just thought I share that story.
Also, physics explains your race track smash. Newton's second law is F=ma (force equals mass times acceleration). The mass of the car, at a lower speed, could not shift the mass of the wall. But the force applied to the wall was increased because of the increase in speed of the vehicle (where it's mass remained constant). So, yeah, going faster saved his life . . . but only because of some other conditions, namely the roll cage in the car being able to withstand the force of the impact (Newton's third law . . . for every action there is an equal and opposite reaction). That is, do the same thing in a mini-minor and you are toast!