Yeah. I started reading Pale Horse, and have done some reading up on Cooper. First thing I can say is this: the second chapter that purports to be a document revealing the Illuminati's "declaration of war on humanity" reads very much like it was written by Cooper himself. It is in his style. That said, the metaphor between economics and electronics is extremely insightful, IMO…. but I get the sense overall that Cooper is somewhat dubious.
My best guess would be that Cooper was in intelligence. What we must remember is that unique mental and psychological properties are likely a prerequisite for being deep in intelligence, and are also probably exacerbated by contact with the secrets of power. So I would guess Cooper got his shit considerably "MKUltraed", and so the truth he spews is also mashed in with lots of confusion, and he fills in the blanks with phantom documents he claims to have seen when in naval intelligence, or found in surplus copiers… Also note how duped he got by the swindlers in the first chapter. That shows an aspect of his mind.
His discussion of history is crude. His discussion of secret societies is likewise crude and confused. One can see how a lot of the "conspiracy theory" beliefs grow out of his claims and his style.
But these factors do not make me assume he is just fake. Because if he really was in intelligence, then, again, we should EXPECT him to have gotten his head messed up.
So nothing is easy, and we can neither accept nor reject Cooper out of hand. IMO