I think the JW mind is influenced and conditioned by fear and greed.
All of the paradise stuff is pure and simple greed. Its all about getting anything and everything that the JW wants, but cannot have right now. Its all hung out there for them in pretty pictures and in their minds' eye. I really think that 95% of them don't really consider the massive slaughter that will have to occur before they get their own personal petting zoo and endless fruit platters. It reaches to one of the most appealing ideas a human can have, that of getting something for nothing.
The fear part is made up of several components, some are very small - keeping the JW in line from day to day. These might be fear of getting caught doing something small by a family or congregation member, and being hauled into the back room. Putting down a small number on their FS report, and being thought of badly by the elders. Buying the wrong type of car for FS and being judged.
Up a notch is the real fear of being kicked out, DFd for a more serious sin. This leads to cover ups, lying, etc.
And then of course the WT uses the big stick, fear of getting killed by Jah at the big A. How horrible if you are killed off while your friends and family make it through.
I think the combination of these fears short-circuit any sort of questioning or reasoning on JW doctrines and behavior within seconds of it entering the mind.