What we seem to have here is three crimes involving the murder of young girls. (Plus the unidentified girl who's death is probably connected to the Anderson/Campbell case).
Law enforcement is claiming all three cases are "solved". No one has been arrested, no information has been released as to what evidence exists, and the identities of the suspects has not been disclosed. Still, the families of the victims can be satisfied, residents of the town's involved can feel safe again, and the rest of us can be assured that justice has been done; all because some Law Enforcement people KNOW who committed each of the crimes.
I don't think so.
These cases are old. Witnesses have forgotten a lot and some are dead. Evidence has been lost. Some cases are just not prosecutable. That doesn't mean information can't be released.
Sometime, the name of the suspect is released along with all known evidence. The Lewiston murders are an example of this method. Other times the suspect is not named but enough information is released so that those close to the case have a pretty good idea who it is even if the general public does not. Some times the evidence is made public without any information as to suspects.
What is important is that there is no Statute of Limitations for murder and whenever an old case is given media attention, there is an increased chance that somebody who knows something will come forwards. People who wouldn't talk before might be willing now. Friends become enemies, wives or girlfriends become angry ex's, town bullies become sick old men. Unlike murder, most "accessory to murder" charges would be beyond the Statutes and not prosecutable. This is a real chance to get folks with information to talk.
Things are a lot different now. Local police have a lot more resources and support for dealing with complex or multiple jurisdiction crimes. There is no reason to cover up or brush aside mistakes and failures from the past.