Ive read a couple of Krakouers books. Mainly he writes about extreme physical stuff like climbing mount Everest. Which he did in an ascent group where, I think, 8 people died. He also wrote a true account about a young guy who went into the Canadian wilderness and starved to death.
As for Mormon fundie groups like the two guys you mention, there are a lot of them about which have made the news when they come into clash with government authority. The Singer clan and the LeBarons spring to mind. Mormon fundies are in a similar position to Russellites compared to dubs, they hold that the church has apostazied from the teachings of the founder. Some of those old teachings involve the old Biblical notion of the "Avenger of Blood" and polygamy. Its inevitable they will come to the attention of the law and that pretty soon the ATF will be encamped around their compound with their infrared sniper rifles.