The Jehovah’s Witnesses for all intents and purposes are a "closed society". Although not being geographically isolated, they confine their social contact and social network to JWs exclusively.
Researcher Steven Hassan writes about closed societies and how those within such a social fabric will look to each other for confirmation that their group is indeed a special, elite group among mankind. Experiences provide the emotional juice for this dynamic.
When a email circulates around the net regarding a pioneer’s "miraculous experience" for example, it confirms to JWs that God and his angels are working exclusively with them, and that they are the only ones who have God’s backing.
What JWs are naively unaware of is; that if you spend any time in other churches (which I have) you will hear countless similar experiences among them as well. Many of them sound just as miraculous as the ones you read about in the online JW chatter.
One thing that always caused dissonance within me was how Jehovah and the angels seemed rather capricious and random in who they protected and who they didn’t. I would read about miraculous experiences of brothers being saved from certain death at the hands of soldiers, for example. And then, I would hear about horrible deaths suffered by JWs (many of them women and children) in places like Rwanda for example. I would read about a brother who got rescued from a firing squad, and then I would read about an entire JW family who got literally hacked to death with machetes.
I believe that the average JW must somehow alleviate this dissonance, so they brush it out of their mind, and continually feed on experiences that confirm their confidence in the Watchtower organization - even if such reports are dubious.
The simple fact is that both miraculous and gruesome events befall people of all religions. Their is no special "holy spirit cocoon" that exclusively envelopes any group.