When the Watchtower came out discussing the Overlapping generation, I had a discussion with an elder about it. You could literally see the cognitive dissonance kicking in.
His paradigm had changed and he was trying to reconcile it. He came back a few days later and simply stated " don't forget, many may claim to be annointed but are not, the end is still very close"!
This is a very intelligent guy, who has had a very successful career and has displayed critical thinking skills. But he doesn't want to face the possibility that 3 generations of his family could be wrong and that he has spent 66 years in a cult.