In response to the post about Evil winning being the message of Twin Peaks--Bob killed Laura because he couldn't get inside her, and corrupt her, like he did with Leland. She was too strong for him. The good in her was ultimately insurmountable. I think the ending of the film with the Angel clearly shows that Bob is the not the end of things.
NAS: I can see the evil winning side of it, because even though Laura ascends into the White Lodge, BOB had made her life such hell that she allowed herself to be killed by him. I'd say that, because BOB wore her down and then killed her, that evil did win. And the fact that a soul as pure as Cooper's could even be taken over by BOB is quite telling.
NAS: I don't know how anyone can interpret Fire Walk with Me as evil winning. Laura stops Bob from taking her soul and ascends to the White Lodge. The story in Twin Peaks might go on but there's always hope for Agent Cooper.