Applying Occam's Razor: 1) The vast majority of murder victims know their killers. 2) SA is most likely at the hands of a family member or care giver. 3) The person who 'finds' the body is often the killer. 4) At times, the killer will join in the search for their victim.
To say that there is no evidence of chronic abuse refutes the autopsy. The parents were firm in their denial of it. Remember how Patsy could not remember calling Dr. Beuf numerous times in one day. Then again, perhaps that should not seem out of place to her? The Rs were surprised by the pineapple findings.
My first and constant question to IDI proponents: By what means did the intruder(s) arrive at & depart from the R residence? Car, van, bike, or on foot?
Aside from that, there is zero evidence of an intrusion. The broken window theory of LS did not work for the GJ, and with good reason. Neither does the stun gun. The intruder(s) knew about the size 12 Bloomis and where to find them quickly in the dark in that huge house? And then, they take extra time after the murder to get, by chance, JB's favorite items - white blanket, Barbie nightgown. Beyond this, the timeline has to be distorted to align with IDI, e.g. How long to write the RN that we have. Then, JB eating the pineapple in the interval before TOD has to fit in. There's a 40 min. gap between head blow and application of the garrote, So, the intruder(s) hung out in the basement, maybe peeking into the gift wrapped packages? They did not touch the liquor. Did they browse the dictionary for "incest"? Moreover, they knew about the 118k, that the dog was at the neighbors', and also that the home security system was inactivated, while 'monitoring' the R's house without being noticed and finding the perfect moment to break in. (When exactly was that?) Managing to leave neither footprints nor fingerprints, not even on the RN. Nor saliva, nor semen, nor blood. For the finale, Dracula morphs into a bat and flies off into the cold and oh so dark mountain night.
It cannot be disputed that JonBenet's three family were in the house Christmas night with her. That part is not a fantasy.