A secret's only a secret as long as you keep it. Once you tell someone it loses all its power -- for good or ill -- like that, it's just another piece of information. But a real mystery can't be solved, not completely. It's always just out of reach, like a light around the corner; you might catch a glimpse of what it reveals, feel its warmth, but you can't know the heart of it, not really. That's what gives it value: It can't be cracked, it's bigger than you and me, bigger than everything we know.
I submit that the real reason we criticized and disliked Lynch's Laura's muddy bothness is that it required of us an empathetic confrontation with the exact same muddy bothness in ourselves and our intimates that makes the real world of moral selves so tense and uncomfortable, a bothness we go to the movies to get a couple hours' fucking relief from.