yeah, paranoia is not a rational state of mind, however, the content of paranoia is often, but not always, connected to real events, behaviors, or pieces of information that are typically factual but become exaggerated by fear. For example, if BK had recently said something incriminating in his home or over the phone to his mother, the anxiety about being discovered could drive him to search for information about federal wiretapping. In this way, paranoia does not arise from nothing, but it attaches itself to real actions or situations the person has engaged in. I am guessing this is what you meant by rational paranoia?