When Bruno Heller told us that we could "trust" the list of seven suspects, I believe that he DID mean that Red John was one of the seven suspects.

I believe Ray Haffner is Red John for a number of reasons:
1. He and RJ like to whistle.
2. RJ has a phobia (according to Jane's psychiatrist), Haffner is afraid of spiders
3. He and RJ are left-handed
4. He matches the physical descriptions we have of RJ
5. I think he and Jane are alike, and that he's almost a little jealous of Jane's sharpness. I think this is a large part of why RJ wants PJ to join him.
6. Haffner obviously has a fondness of Lisbon, I believe Haffner as RJ did not kill her for this reason.


Just a theory about what kill happen this season:
Van Pelt and Grigsby are too happy... married and living with Grigsby's child. I believe RJ will kill Van Pelt and the baby to get under Jane's skin, mirroring the murder of Jane's family.

Also:
Why has RJ been so careless? I believe RJ is a very smart person. I can only believe that he's been putting clues out there for PJ because he likes the chase and he's ready to be caught. I'm curious to know more about RJ's background.