Exactly DB74. Parents, so called, abdicate all responsibility for their child's safety and well-being to someone else, unknown and unidentified. If the unfortunate child is injured as in this case, it's "someone else's" fault. Why can't parents face up to their responsibilities for their children by supervising at play? Apart from motorists who wish to use the public roads to drive on untrammelled, there are other dangers children face these days, from potential abductors or abusers. Protecting children from these dangers is also "someone else's" responsibility I take it, maybe even the motorists.
Knowledge and use of the Rules of the Road, lights, helmets, hi-vis vests, knee and elbow protectors and appropriate supervision that's all that's needed to keep children safe from the evil motorist. Equipping and supplying all the prerequisites are the responsibility of the parents.