Abraham Maslow would say that "legacy" is a legitimate motivation, or the desire to leave something meaningful of oneself to future generations.
Let's face it, most of the old guard of the WTS, the stodgy old farts in the ivory towers at Bethel, have no children to whom they can bequeath their "wealth" - whether that's in terms of financial wealth (hey, somebody has the keys to the vault!) or the legacy of being a Big Shot within the Organization™, or just a vast library of WTS Publications™ that date back to the very beginning.
And, yes, even if they have serious doubts that they never dare to breathe aloud, their egos demand that they stifle their doubts, otherwise their entire lives will have been for naught. Their reputation, their status, their following, their groupies who hang on every word they speak from the Platform™ at Conventions™ and Special Talks™ all depend on hanging on to the bitter end, even if they know to the core of their being that it's a crock of crap.
