Some of the many thoughts that kept me awake last night....
I never really thought that Lori was capable of living a double life -- she has never really done that because she's never really had to do it. She would tell anyone bizarre things about her life with laughter and charm. And I only realize in hindsight how disarming that can be when the words and the behavior don't match up at all. I doubt anyone has ever called her on any of the crazy stuff in her life. At least not until Charles tried -- and even he couldn't get anyone to see beyond the pretty, breezy, charming person she (also) is. Lori obviously knew not to implicate herself in the death of her own children and then laugh it off, but short of that....
Chad, on the other hand... he has much more experience living a double life than she does. And that's the total opposite of what I would have expected on the surface. How long has he been living in a home with two dead children in his backyard? Crispy white shirt/tie LDS man with a leadership position, grieving widower taking the kids to Knotts Berry Farm, Hawaiian vacationer on an extended child-free honeymoon (add a whole bunch of other stuff here), it'll all make sense later.... he's not at all who tries to pretend he is. The fiction he tried to pass off as non-fiction, all of his extremist beliefs -- so much of his life is not at all what he would like others to believe it is.
Chad and Lori are both very good at deception and manipulation, and neither one of them has any comfort at all in their own skin -- but this stuff is manifested in totally different ways in the two of them.