They just want Castle to be a fun character, I don't see the problem.
I just explained the problem: I think that mystery writers would be more inclined to think critically and see through deception, and thus less inclined to buy into all the supernatural nonsense they keep having Castle believe in, stuff like UFOs and psychics and now ghosts. I think it's a mischaracterization.
Christopher, have you ever met
Writers are as prone to be batshit insane as the rest of the world. I'd give you examples, but life's just too short.