This really gets at the heart of the allure of conspiracy theories. If you are already predisposed to believe that something nefarious must be being discussed,

This really gets at the heart of the allure of conspiracy theories. If you are already predisposed to believe that something nefarious must be being discussed, the simple presence of ambiguity in the discussion becomes "evidence" of conspiracy. But that ambiguity is likely the result of the readers of the email not having very much context into the conversation. Email is not the only form of communication these people use to communicate. They also speak on the phone, as well as face to face. They likely use instant messaging and SMS. They also likely pass messages through intermediaries. They likely share memos. This is rational human behavior common to nearly every person in the world with access to the relevant technologies. What is truly maddening about conspiracy theorists, especially those who have gained a following, is that even the simplest, most rational explanation can easily be cast as a coverup of the conspiracy. If you have already inspired fear in someone, and gained their general trust, you can perpetuate that fear indefinitely, so long as undeniable evidence to the contrary is not presented.