I've often wondered about the benefits vs. costs in feeding the paranoia of those with power in the Watchtower cult.
Increasing the paranoia is surprisingly easy. One way is to feed their fear of having "apostates" in their midst. They clearly do have people on the inside that are no longer loyal, as demonstrated by leaks of sensitive material. It's one thing to fear the boogeyman when he's outside the walls of the city. Believing that the enemy has breached the defenses of the group and now walks among them is a whole new level of fear.
I feel that stoking the leader's paranoia could create a positive feedback loop whereby the leadership becomes more authoritarian and heavy-handed. This slow but noticeable change in the control exerted by those in charge could be the wakeup call that many of the more moderate followers need. The more "sane" members will be marginalized, even pushed out by the increased pressure for loyalty to the edicts of the exalted Governing Body. The demographics of the group slowly shifts, until the more extreme members become the majority.
However, those who can't see a way out of the group are then subjected to the increased control over every minuscule detail of their behavior and emotions. It's admittedly a dangerous gambit, one that I somewhat troubled by. If the end result were decreased membership or a decreased growth rate, and therefore less people ensnared in the cult, than the ends could justify the means.