I agree - I always thought it was JonBenet's older brother, and the parents couldn't bring themselves to admit it.
This would make them complicit, wouldn't it?
In any case, Roy Romer (former chair of the DNC) was governor of Colorado and the Ramseys were big donors. I think Romer squashed the investigation and I believe Romer left the DNC chairmanship for reasons related to the case. How nice. (I recall hearing Romer is superintendent of Los Angeles County schools...)
There is one hell of a lot more to this picture than just a simple murder.
I also agree. I always thought the most plausible explanation was that JonBenet died accidentally, perhaps from roughhousing with the older brother, and the parents covered it up to make it look like an intruder was responsible. That would also explain the strange behavior of the parents during the police investigation.