I am still stuck on the pineapple thing.
When the family got back home, Burke asked for some pineapple and his mom gave him a bowl on the kitchen counter area.
Then comes JonBenet and she tries to help herself with a piece of the pineapple from Burke's bowl. Burke pushed her away from his bowl -- much rougher than he meant to do.
JonBenet fell on the floor and her skull was badly cracked.
Hearing the argument and the noise, etc., the parents, or at least Patsy, came into the kitchen and saw a very bad situation.
Then, all heyell broke lose and then the situation began. IMHO.