I thought the same thing, especially when I read that his ex-wife's comments busts up his story a bit.
Did you know that according to today's Washington Post, male DNA residue was found in her underwear, but police never reported a match for the sample? I can assure you that the sample didn't belong to anyone in the family or else one of them would be in jail by now.
Also, as per the WP, in a 2003 libel case, US District Judge Julie Carnes in Atlanta concluded 'the weight of the evidence is more consistent with a theory that an intruder killed JonBenet that it is with a theory that Mrs Ramsey did so.' Lacey, the district attorney in Boulder, issued a statement saying she shared that view.