What about all the answered prayers and experiences in the yearbook/watchtower?
In logic there is a very specific kind of confirmation bias known as Post hoc ergo propter hoc. Imagine an old man who prays to win the lottery and then the next day he wins. The old man might conclude that, due to his one in a hundred-million odds of wining, God must have answered his prayer. However, what he isn't aware of is that 90% of the people who bought lottery tickets ALSO prayed to win. He is suffering from availability error because he is not taking into account how many "unanswered prayers" there were for him to get his one "answered prayer."
Likewise, in many of the yearbook accounts they are only looking at all the good things that happened to the witnesses without addressing all the bad things that happened to the witnesses. This is confirmation bias. We all know that good things happen to people. We also know that bad things happen to people. I could take a random group of 7million people and then write a book about only the absolute best experiances of few dozen of those individuals. Out of 7million people, I would be able to find some pretty good/extraordinary stories. Where the logical flaw comes in - is acting as though that cherry picked sample reprents the norm amongst the entire group. Even worse, would be to draw the conclusion that since a few people had some amazing experiances, the whole group must be Gods chosen people.
The Yearbook is cherry picked data. It would be like driving through Beverly Hills and then concluding that every single American in the USA is a multi-millionare. Most Americans don't live in Beverly Hills. And most JWs don't have Yearbook experiances.
This is done at the Kingdom Hall level too. The elders say, "You should FT pioneer. Look at Joann, she prayed to Jehovah ernestly and she was able to do it. You can do it too!"
What the elders don't notice is that Joann is the exception at the hall. Her parents paid off her mortgage and her husband works a good job and they can afford to not have her work. And the elders completely ignore that most JWs are living pay check to pay check swimming up to their eyeballs in debt because they never got a college education and they can't afford to work part time. Most the JWs who "should be pioneering" drive cars with 200k miles on them because they cann't afford a new car. All the while Joann the FT pioneer is riding around in a brand new $50,000 SUV that is paid off.
Its amazing how Jehovah only blesses those who come from upper middle class homes so that they can pioneer. And that he doesn't bless those who are poor and trodden upon. Joanns sacrafice to FT pioneer is not being able to add a third family vehichal after they purchase a boat this year. Where as the poor JWs sacrafice to aux pioneer two or three times a year is that they can't afford to get that new set of tires their vehichal desperately needs. But everyone acts like Joann has done some amazing feat while the R&F witnesses are just a bunch of slackers who may or may not make it through armageddon because they are so spiritually weak.