As far as I know, even if the BCA and the FBI are "involved" in the investigation, I think the Stearns County Sheriff makes the decisions.
I think people want answers. I think it's wise to consider all angles, and that maybe there is a possible cover-up.
If everything goes back to the SCSD, then maybe that's where the problem lies. At this junction, why not ask LE some questions about why this has gone so long unsolved.
I don't think the FBI/BCA has as much power as some people think when it comes to investigating this. It's the SCSD juristiction.
Seriously? This crime is known worldwide and we are to believe that FBI agents or BCA agents would turn a blind eye? That strains credibilty.
And not only that, let us say there is some incredible super power the sheriff has, it is beyond unbelievable that if the W family was told that action would not be swift and sure.