I will fall off of my chair if Karr is the actual perp in the Jon Benet murder.
The reasons that I feel this way are:
In 1996, as compared to now, Karr was very much in his infancy in his young girls fantasy.
While it is true that he had just been dismissed from a substitue position for being overly friendly to young female students, he hadn't, as of that time, as far as we know, yet begun to become the outwardly weird, and totally obsessed, individual, he is today.
The person he is today, most likely possesses the attributes needed to commit the Jon Benet murder type of crime.
The person that he was in 1996 wasn't even close to being able to commit that type of crime.
In 2000, with his moving his family to Petaluma, CA, JMK was apparently more obsessed with the Polly Klass murder, than he was with the Jon Benet murder.