People just believe what they want to believe.
That's why fairy tales/nightmares so often come "true."
I'm thinking voodoo, visitations, self-fulfilling prophecy, and most of all, "groupthink."
Groupthink is a marvelous way for groups - (including modern corporations and the individuals that follow the norms of the corporate subculture -- think Enron or Nestle during the infant formula scandals of the 80's, or perhaps even of the many genocides that have occurred thruoughout history -- yes there are other factors, but groupthink is essential to the "patriotism" or nationalistic or racist or armageddon-centered agenda/ theory) -- to justify stupid or unconscionable, amoral, and self-aggrandizing manipulation of the larger culture and of the culture within. (Yes, I know, great, big fragment upon fragment . . . stream of consciousness) . . .
JWs are experts at such self-manipulation and denial of (others') reality.
They believe, and thus create their own reality.
It is like a never-ending feedback loop, until someone caught up in it, breaks free and joins the outer world.
Then their "defection" is viewed not as a natural consequence of the human need to be free, but rather a result of supernatural, Satanic influence on the "heart" or mind of the defector.
It's very typical of groupthink for the "defector' to be castigated, outcast, fired, tortured and even destroyed from within the groupthink tank, whether the tank is a religious one or a political one. And once that pattern is established, the mind creates its own pathways to functioning and surviving within the tank. Denial of reality, facts, and/or the deeply-held "true self" is one of those multifarious mental pathways to conformity and survival in the very small, Armageddon-centered universe of the cult religion.