I love this, but there's one thing I'd point out. With few exceptions, there's little defection from secular society into fundamentalist religious communities. Almost everyone in those communities was born there.
I don't think "Natives were less racist" is a convincing explanation for how badly white colonists wanted to return to living with them (even when, according to Franklin, the white society they had returned to was as kind as possible to convince them to stay). It may be a part of it, but doesn't explain why everyone who lived in Native culture was so disgusted with white culture after.
[0] https://founders.archives.gov/documents/Franklin/01-04-02-01...
No, it doesn't explain that part at all. It does explain why the Natives never tried joining and integrating into the white colonial society.
Honestly, I'm curious why white people who had been taken prisoner wanted to go back so badly, but sadly, I doubt anyone ever asked them and then accurately recorded their testimony for people to read 250 years later.