y
For me, your question is a classic chicken/egg query.
It has been my experience for over fifty years that the org doesn't convert humble individuals into arrogant nay-sayers ... rather, I believe the program ATTRACKS those for whom the idea of superiority over others amounts to a high.
These holier-than-thou folks would have been the same if they had joined the PTA, the Lions Club, or a neighborhood civic association. The JW Org is easy pickens for wanna-bees because a cult does not care what your motive for participation is, all they require is complete allegiance to the concept. I may be a little different here but I don't blame the RANK at headquarters who are paid well to operate the cartel , as much as the FILE in the KHs, who are willing to sell out in order to obtain their fix.