They look guilty because of the ransom note.
There were multiple copies of the note written on the pad from the home with a pen from the home. The killer[s] sat there and wrote and re-wrote the note ...
There were allusions to movies Patsy liked, John’s bonus, and Patsy’s religion. The note was bizarre.
Yeah, I have to say that the note screams involvement by the family in the coverup. One thing everyone can agree on is that the lengthy note was written after the fact to make it look like a botched kidnapping. The reference to 118,000, SBTC, “and hence” sentence structure, and the fact that Patsy didn’t even hesitate to call family and friends as well is all enough to give one pause. It’s certainly not hard to see why certain people think Patsy was involved. I’d say the repitition of this particular DNA sample is enough to prove involvement by an outside party, but that alone shouldn’t exhonerate the family from the coverup. Let’s not forget that the first time this DNA was sampled it was in a mixed blood sample on Benet’s underwear, not in an area where contact was only assumed - that one hit might have been a mistake, but to find it again on two other spots of a different piece of clothing? That screams outside involvement.