Accident are extremely rare, crashes are common, all parties are usually to blame, not necessarily in a legalistic sense but in a practical driving sense, most of these are due to not thinking about driving (passenger in the driving seat syndrome).
I would agee, except that I don't agree with the term "usually".
"Sometimes" or "often" possibly.
There are occasions when an innocent driver is absolutely unable to safely avoid a resultant collision by another driver's crass stupidity. In such instances, it would not be justifiable to reduce the onus on the offending driver by trying to apportion blame on the innocent party.
For example, a little over a year ago, I had to stop for traffic crossing from my right at the Kidlington roundabout on the A34 in Oxfordshire.
I was in the outside lane, waiting to turn right, and had been stationary for possibly 10 to 15 seconds. An M-reg Ford Fiesta rammed into the back of my car, then shot around me and made off towards Oxford.
The police never caught him or traced the Ford and, eventually, I was informed that the vehicle had been stolen in Bolton and used in a burglary.
The attending police officer told me that I had absolutely no way to avoid the collision and that I was in no way to blame for any part of the incident.
And a traffic policeman's opinion is good enough for me.
There must be hundreds of RTC's all around the country where it is patently clear that the innocent driver is totally free of blame. In these instances it would be unjust, and an insult to decent drivers, to attempt to deflect a portion of blame towards the innocent party.
The degree in a combination of skill and good fortune can be so miniscule in the difference between avoidance and collision, that the ability to prevent collision could not be fairly assessed.
Most of us try to anticipate the "unexpected", which is itself a myth, since it can be deemed that the "unexpected" that you allow for then no longer becomes the "unexpected".
And it is then the very elusive "unexpected" that brings about the unavoidable collision; regardless of a driver's alertness and/or ability.
There is a world of difference between classroom theory and on-the-road reality.