Since the R's have no socioeconomic issues that are present in 80% of filicides, that would put them in the minority class for filicides. Now, add to that zero history of alcoholism, drugs, domestic violence, jaywalking, etc., etc. that probably would put them in a very narrow minority of filicides. And we havent even brought up the sexual assault and strangulation, which is uncommon in filicide. Further, the ransom note that paradoxically invites the FBI is also bizarre.
I can't imagine any LE that would attempt to invoke the 'oh when you find a child dead in the house' filicide statistics, when the crime doesn't even fall within the bell curve.
Its what you do when you've got nothing else. I mean, if it were PR or JR DNA in the underwear/longjohns it would've been over. Nobody would be reaching out to things other people have done in order to apply a stereotype for behavior simply because they are parents.