No doubt. You sometimes wonder how they ever passed a driving test. Any examples you can recall from the course as to just how wrong some drivers apparently are?
I think it's mainly thoughtlessness, carelessness and not paying attention, maybe that's an obvious thing to say.
On my course I was in the distinct minority of knowing both my speed and the limit at the time of my transgression. Many there couldn't identify the correct speed limit from road examples, and/or didn't know what speed they were doing when they exceeded the limit.
I mean, almost being run down at a pedestrian crossing by a little old lady too interested in talking to her companion to pay attention to the red light, that's the main type of problem in my opinion, and so the courses are an attempt to make drivers think more and pay more attention.
For those of us who say we don't learn anything from them, I would counter that a period of reflection on why we're there and what we can do to change our bad habits is useful. So different people take away different lessons from the courses, most of it useful, I certainly didn't find it a total waste of my time.
Given my driving record, I'm obviously not a good driver, but I have both good and bad habits, so trying to eliminate the latter has improved my driving, and the course helped with this.