I agree they completely fumbled the investigation. But saying it’s an intruder is a straight up fairytale
The odds that Ransom Note, being written by a lone wolf (or a team of wolves), who snuck into a house in an extremely quiet neighborhood without alerting anyone, without leaving any footprints, fingerprints, significant DNA or any evidence whatsoever, and deciding to just utilize whatever items they could find in the house (notepad, pen, paintbrush etc.) is extremely slim.
Even if you say it's someone who knows them, would they have been able to enter the home, confront the child, assault and commit a murder, place the body in an obscure, concealed basement room, remember to latch the peg, then take the time to find the required writing materials inside the house to create the note without disturbing or alerting any other occupants?
there was pineapple found in JonBenet's digestive system. meaning she ate recently before she died. it takes pineapple 30 mins for it digest in your system.
So the intruder also fed her?