The last three books are much more a case of a moment of history, what happened almost by accident or coincidence, like being in the same elevator or lifeboat. ↗
History is full of examples of people who clamp down after they began to enjoy too much freedom. Freedom can lead to instability, anarchy, and confusion. So there can be a moral counter-revolution. ↗
Although his crusade in 1957 occurred at a time in our nation's history when race divided all, Reverend Graham refused to preach in segregated audiences. ↗
The story follows the whole family. But pretty much all the characters who are in jail have written a book about it, so you've got their perspective of it, however skewed they want you to see it. ↗
When you have an idea for a story, you want those characters to reach as many people as you can. I think you normally think of prose as a way of doing that. It fits our time, the culture. ↗