Godor and Marc I agree, its the speed and idiot dirvers that kill, not the car.
I used to do stupid shit in my 1st car too.
But high speed in a shit box like my 1st car would take a long country road and about 10 mins to get to top speed.
With a performance car all it takes is a back street and 20 seconds.
Therefore you are less likley to be reaching higher speeds in low performance cars, because backstreets and the such don't physically allow it.