The speed limits are set artificially low to try to reduce fleet fuel consumption, yet are well known to increase the probability of accidents since they violate the 85th percentile principle. Attempts to enforce the artificially low speed limits cause more collisions while claiming to be intended to prevent collisions. Given that, it makes perfect sense why he cannot understand it. It is unfit for its stated purpose.

Even more severe than high speed is driving while sleepy, but nobody is proposing a law to regulate sleep. Also more severe than speed is the mass of vehicle. Severity is also far more impacted by vehicle mass, but I don't see any movement towards regulating vehicles be as heavy as possible.

I can come up with many more examples to illustrate the stupidity of focusing on severity and speed versus frequency and probability.