I'm writing an essay on "A Personal Exprience with Religious Fanaticism" (I'll post it here when I'm done, although it is intended for a non JW audience). This has led me to doing a lot of research and I was really struck by something last night.
No matter what the subject the Watchtower has to have a single right answer. A ten headed dragon in Revelation has to mean one particular thing, no matter how silly. There can't be a variety of possible answers, and certainly they can't just say "well nobody knows." As a contrast I have a five volume Bible encylopedia published by Zondervan. When discussing something like the rapture they will lay out the pros and cons of the various views (in this case pre-tribulation, mid-tribulation, and posttribulation) and let the reader draw his own conclusion.
By sticking it with its only-one-possible-explanation interpretation that Watchtower creates situations where parts of its various teachings disagree with each, or have to be explained away. Of course if they leave it up to the members to think for themselves they will be out of business.