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Impatience + Stupidity
If all cars had at least a top-speed limiter then when crashes did happen, the outcome severity would be reduced, since no one is doing more than 70 rather than 110 or whatever people roll along out now. Also, if the top speed was limited you wouldn't have everyone piling into the overtaking lane while the other two lanes remain empty. Also, your reaction time doesn't need to be so quick so the number of accidents would be reduced.
All this could be applied in towns too but the car driver vote is large and ever driver is special...
I've seen enough over confident driving to call bullshit on that.