I think that the main point here is to stop people involving emergency services for minor accidents, as some people still think that even a minor accident is like a crime scene, and refuse to move cars until the police arrive.
When coming across any accident that looks serious (as mentioned in the brochure) and may involve power lines, fuel spills, injuries or the chance of them, best to leave it to 000 to organise. Also, be aware of un-deployed airbags and other such tertiary safety devices etc, as they can be a hazard if they haven't deployed; just don't lean across them or anything like that!