The murders of Brenda and Erica Lafferty we're horrendous. This book does a lot of work to explain how religions like Mormonism, especially radicalized fundamentalist Mormonism, can warp the world views of it's followers, shaping some into devout followers who are used and abused in the name of God by those in power and to create powerful, often delusional believers who are willing to kill, rape, and defile anyone from family members to strangers for the sake of their personal perception of God's will.
In the author's notes at the end of this book, Jon Krakauer addresses the path his writing process took. While his end product was not what he initially intended it to be, it was enriched by the research he'd done on the history of Mormonism. Having grown up in an area with a few Mormons, but not enough for them to be the dominant social group, I'd just lumped them into the group of people from religions I was not a part of. This peek at their storied history, historic and continued racism, historic and continued sexual violence and pedophilia, and the lengths to which the current church goes to hide the past from followers gives a suspicious tilt to the religion's intentions.