Common Sense-
To deflect suspicion placed on family members:
1) There needed to be at least the suggestion of an open window, an open door, a break-in, or multiple house keys in the posession of people other than family members, in order to suggest an intruder. Both the possibility of entry by an intruder through a door and or through an open window were provided.
2) Motive needed to be established and the RN was written, (convoluted as it was).
3) Prior sexual abuse needed to be covered-up so JBR's body showed evidence of current sexual abuse intended to defelct blame away from the actual abuser(s).
4) If "kidnapped", JBR could not be found in her own bed and she wasn't.
5) Evidence needed to be cleaned away so JBR's body was wiped down and clothing was changed. (Although apparently not done well enough as fibers were indeed found!)
IF it HAD been a kidnapper:
Why JBR? Why not BR? Why not both children? Why not PR knocked over the head while out shopping and shoved into a van? Was PR not worth a tiny 118,000 dollars ransom? (And please don't say it created too great of a chance for the kidnapper getting caught, to kidnap BR or both children...or PR. If it was a kidnapper, this IDIOT took the time to gather all items used from within the home and even wrote the note/novel inside the house and then took the time to molest and abuse JBR there as well.) Why would a kidnapper do this?
If we try to assume it was the abuser and that abuser was not a family member, and he/she was trying to cover up the crime of abuse:
Why in Heaven's Name would an abuser/intruder do 1-5 above to make it look as if a Foreign Faction kidnapped JBR? Why would he simply not just kidnap JBR and dispose of her body elsewhere or simply kill her in her home, leave her there and TRY to place blame on her family?!? If he needed time to get away and chose to write a RN, why not 20 words or less. Why a NOVEL? Why would any intruder go to such extensive lengths, taking so many chances of getting caught in the act, all completed within the home of the victim at the very scene of the crime? (With PR admitting to writing the "Mr. and Mrs. R" note from this same pad and calling it a practice "invitation", and with her evident similarities in handwriting and linguistics, we are 99.9% sure that she was the author of the RN!)
It is the CONVOLUTED EXCESS OF EVIDENCE that makes this crime point directly to family. (The Evidence: The physical evidence, the lies, the truths and the cover-ups.) In general, CRIMES THAT ARE NOT INTENDED TO COVER-UP FOR PERPS CLOSE TO THE VICTIM are NOT this complicated. They are relatively 'simplistic' in nature, IMO.