Half banana - "...all at HQ seem wedded to the concept of a divine rightness of The Organisation. In the minds of the GB and through their historical activity going back to Rutherford, it seems to me that they have sacralised the organisation (exactly as they do the Bible) to cultivate it as the product of God's hand..."
Indeed.
From Rutherford's time, a key aspect of the WTS's survival was perceiving itself that way - for two fundamental reasons...
a) ...that personal certainty enabled them to project it outward convincingly to disgruntled Christians looking for an alternative to the perceived "liberalization" of their churches, who then became the Org's newest and most active recruits, and...
b) ...to keep said recruits and justify the growth they engendered, the Org was compelled to further push the "God's Exclusive Earthly Organization" rhetoric, by effectively de-legitimizing the legitimacy of any other religion...
...but...
...running the risk of the same for the WTS if those members ever realized said rhetoric was untrue.
As a result (from their POV), they have to either...
a) ...remain Captive to the Concept, or...
b) ...admit the WTS is a "false religion" and exit, with all inherent loss involved, up to and including everything (depending on how much one has committed oneself to the Org).
As a result, the Watchtower heirarchy has evolved in a way that the higher up one goes, the more difficult that option becomes...
...to the point where at the top, any other perspective is - for all intents and purposes - impossible.
As a result, the Governing Body - whilst knowing it's wrong - still believes it's True...
...at the same time.
They have no choice.