I don't want to assert anyhing about any 'vast majority', but I am reasonably certain it is socially acceptable among most drivers to injure (or worse) another road user through a "moment's inattention", even if that inattention were caused by low sun, lack of sleep, distraction caused by hands-free mobile or passenger, unexpected happening on the pavement, ... and as long as "sorry mate I didn't see you" or "he came out of nowhere" are perceived as mitigation and not as the admission of guilt that they should be, I really do think Adrian has a point here.
I base my certainty on the likelihood of such a driver after an accident of getting sentenced to much more than three points and a slap on the wrist. I accept that the legal system may lag social norms slightly, but not that much