I remember when I first came in the "truth" I was told about all the apostasy and cleaning out of Bethel. That was a warning sign. I was so ignorant to think, how good this was of the Jehovah (through his org) to keep his congregation clean from the top to the bottom.
For those that put their complete trust in the org, all it would take is for some form of the org addressing by way of literature, from platform etc. to close up any doubts that stemmed from abrupt departures.
On any of the levels Blondie mentioned above, entire families, congregations, etc. the WTS would have a way to spin it to blame the "faders".
Our last C.O. Visit, he talked about the various reasons many are no longer here, some of the them were things like, they gave in to fear; failed & got themselves involved in wrong doing; some fall because they had personal weaknesses, but made the choice to back off or refused to get help.