Is it a reality that the level of police resources directed at a crime against a child is determined by the amount of public attention that can be garnered?
Unfortunately yes.
The creaking door gets the most oil.
There are other equivalents as well.
Did the hunt for the Jill Meagher killer get more resources because the police knew that the ABC were always going to keep it in the public eye ? Maybe.
I suppose the police may think that if the public doesn't care about a particular victim, why should they ? On the other hand there have been examples of cold cases being solved from long ago where the public forgot they ever happened. It depends how conscientious the police on the case are.