I’ve seen this flat affect before, from Chris Watts to BTK. I believe he is a lot like them, a sociopath. Their crimes are different, but it’s like talking to the same person. You’re right, it’s not something you develop overnight, but it takes time to really see it. I also don’t think boot camp “broke him,” I think it merely exposed him. I think he came home the same way he left, only angrier. I think he is an evil loser, not mentally ill. We just see this differently.