Batman: Am I reading that the cause of death is slow drivers? Ban slow drivers or install a minimum speed computer?

There are economic and safety advantages in doing so. It depends on where you think the buck stops - the simple answer is that the buck stops with the speeding driver, but the deeper thinkers will ask why the driver was speeding. You only die from speeding once, so if the buck truly stopped with the speeding driver, it would surely be a self solving problem. It is not, therefore the buck obviously doesn't stop with the speeding driver. 

Most (not all) fatal incidents have more than 1 contributing factor, and elimination of any one of the factors would have changed the outcome. When a single solitary factor is repeatedly villainised (statistically less than 20% of fatalities are due to speed but how much do you hear about the other 80%?) then either the narrator thinks the audience is stupid or the narrator is stupid. Either way 80% of the opportunity to solve the problem is being overlooked, so at best reducing speed with 100% success, will reduce the road toll by ~20%. We still have a big problem Huston! Speed wasn't THE problem.

Failure to keep left is a leading cause of death on the roads - why and when do drivers fail to keep left - when overtaking is a leading cause. Why - because there is an impeding vehicle. Suddenly slow drivers feature as a causal factor in 2 leading categories of the road toll.

Following too close - another cause of accidents - well, the buck stops with the following driver you may say, but why and when do drivers follow to close?  When stuck behind an impeding driver. I could go on, but you are probably getting the picture.