I do agree that everyone that causes an accident caused an accident. However, inattentiveness is already extended to those who are also under the influence, it’s just that their inattentiveness is superseded by the drugs they took to specifically damage their abilities to function. So those who drive while being inattentive is already allowed for those who might drive purposefully impaired.
If you want to say that anyone who has an accident should be treated as though they were driving while purposefully impaired, then I’d say that is profoundly wrong. I think you would agree.
No everyone who causes and accident should be treated as though they caused an accident. Of course some people are inattentative, but many are just poor drivers. I happen to think poor drivers should be punished for being poor drivers. Maybe not the same as drunkards and dopers, but punished nonetheless. It would encourage them to be better drivers.
An egregious example is the old guy who drove through the Santa Monica farmers market and killed all those people, and then got off with a slap on the wrist.