I have been rewatching The Mentalist on TV lately, and it seems to me that Red John's motive is never revealed. I could find nothing on Wikipedia and various fan-made wikias, so I wonder:
Is Red John's motive ever revealed?
Or do I miss somethig (or some episode)?
I am not referring to Patrick Jane's family, I know what happened in that case, I mean in general: why did Red John kill all those people.