what worries me here is the number of people who gather at an accident site to watch, the entertainment on offer! wouldn't want people like them "helping" me! But it really obvious that if someone is bleeding or choking to death they should be helped by staunching the flow of blood or clearing their airways.
Still I remember the story of a friend in Saudi who pulled over to help at a fatal accident scene, police arrived, took the victims mobile phone, rang a number stored in the phone, asked "do you know who owns this phone" when told that it was the phone of the mans son, the policeman said "he is dead" and closed the conversation! wouldn't want him helping me too much either!