One thing that made it easier was the full collection of "Studies in the Scriptures" that my mom then had possession of.
The next thing was an elder who freely explained to us what happened in 1975 (and the years before for him, personally). He did not criticize, but he did not whitewash. He just spoke his truth.
Soon after, the youth meetings (where he told us that) ended and then soon, he was no longer elder and last I knew he moved out of the area he had lived all my life (he had been an elder as long as I was alive til then.)
None of those were "it", but they were all straws on the camel's back. I lost that conviction of my childhood upbringing of "knowing"it is the "truth". I then questioned EVERYTHING.