Just a respectful reminder that "turning on a light" was more difficult than your statement suggests. Fleet White, iirc, stated he tried to turn on the light when he first went to the wine cellar and felt around in the dark trying to find the switch. He couldn't find it. The light switch was down low and set back on the wall in an awkward place that was totally dark. He stated he did not see the white blanket on that first trip and was somewhat at a loss when he returned with John Ramsey since John exclaimed that he saw the blanket and knew it was JonBenet before he (John) turned on the light.
That's true, I'd forgotten how difficult the switch was in the WC.