Here is why I believe the Ramsey family (Patsy & John) is involved in the murder:
1.) Notebook paper and pen were items from the Ramsey home itself
2.) The ransom note must have taken at least an hour to write (6+ pages) inside the home (see 1)
3.) The parents let their son stay at a friends home unaccompanied by them all the while there was a ransom note and subsequent murder in their own home. At this point, how could it be established that the Ramseys could feel comfortable leaving their son in the care of anyone besides law enforcement or themselves unless they knew he was in no danger of a kidnapper/s?
4.) Patsy referred to JonBenet on camera as "that child".
5.) Patsy (while alive) and John have done absolutely nothing to help the investigation. In fact, I would say they impeded it.
6.) Left the Boulder, CO area relatively soon.
7.) John just happened to find the body of JonBenet in the basement. (only when friends were over at the house)
8.) With all their money, have they done one single thing in regards to helping others who have gone through similar events? By that, I'm not saying a $100,000 to just shut up donation by John. Take a look at someone like Mark Lunsford (father of Jessica), with relatively no money, and see the difference.
9.) John is a very strange man (notice his inability to look at someone/camera in the eye). Patsy was odd as well. If they weren't involved, they may be 2 of the biggest cold fish that's ever come down the pike.
My theory:
I believe John molested JonBenet frequently. I believe Patsy knew about it. Something went wrong that one night in 1996. Whether Patsy caught him in the act or John was performing some sick sex act on JonBenet is anybody's guess. Either way, I think Patsy thoroughly enjoyed the high lifestyle she had. She decided to protect John because if he was finished, so was she. She wrote that ransom note, there is no doubt in my mind. It was carefully constructed. The whole murder scene was. So was the phone call. The Ramsey's were a wealthy and prominent family in Boulder. They had clout. The crime scene was so contaminated because John called everyone of his pals to come on over to his house. I believe this was a strategic move planned all along by John. He wasn't stupid. Although they are reopening the investigation, I find it unlikely that too much will come of it because of all I mentioned above.