Why is the law so soft on motoring crime?
Could it be that the basic laws were drawn up in the early days of private motoring when drivers were of a certain status and seen in the community as pillars of society not to be compared with the lower classes? Their motoring crimes were considered to be minor mistakes (accidents) not to be compared with knifings, shootings, housebreaking, bank robbing etc. and thus not deserving of severe punishment.
It seems that motoring law has never adjusted to the fact that nowadays almost everyone regardless of their sense of responsibility can be driving private motor vehicles.
You could well be correct.
However, my theory is that, because a high proportion of the population drives a car (or, can drive a car), and, most people, if they are honest, would admit to at least one bit of folly (even if minor) when driving, or, could at least imagine one of their relatives committing such a bit of foolishness, there is no real public appetite for stricter control.
An example. One of my Sisters-in-law, a none driver, who would often complain about drivers travelling too fast, was a passenger in her son's car, when, he was pulled over for doing 40 in a 30 limit. But, she thought that, "unfair". I don't think she is unique.