I think we must recognise a more serious significance in the adoption of the bunker or siege mentality.
It usually happens in groups who are isolated from the rest of the world, often held in the thrall of leaders who use the situation to foster a sense of unity and prideful identity among its members. The notion of persecution is a critical propaganda ingredient and North Korea is a good example. Note how the leaders prosper and rank and file sacrifice all they have. Loyalty is praised as the key virtue.
For Jehovah's Witnesses governance, the concern is that they are weakening in their influence over a community who are able to get an alternative and a more accurate description of what is going on through the internet. This loss of authority has triggered a response from the leadership to heighten the fear and consequently the believer's dependency on the words of the leaders.
My own musings on this are to do with the fact of the governing body's complete negligence for the welfare of the sexually abused in their midst has exposed them to public shame and justifiable censure. Many governments are now on the JW org case. Yet any persecution is fuel to their paranoid teachings so the believers, who are insulated from the real reasons, will only interpret it in the way the GB spins it, not realizing how selfish and truly heartless they really are.
Nevertheless the JW org is clearly moving towards hunkering down in the bunker.
It is significant in a political or religious group to move from one mode and into a siege mentality. It usually presages big changes or even total breakdown as with the denouement of the David Koresh group at Wako.
Doomsday cults do not usually have a good shelf life and one hundred and thirty seven years is stretching any intelligent person's credulity.
Let's hope that it heralds a grand awakening........... even among the leadership; that Jehovah's Witnesses are participants in a monumental confidence trick.