The parents and the drivers should take the legal responsibility and be punished. Those 18 people should be condemned by everyone that has basic conscience. No one said that those passbys should or would take the responsibility.
The irresponsibility of the parents and the criminal behavoir of the drivers can not make those 18 people's indifference become acceptable and be right. They lack the basic intinct to act as a human. Help this dying girl will not make you 高尚. but will make you as a human being. Think what you want if you or your family in this situation.