Oh I forgot. When Larry Ganem said the bunker was secure against all evil, he probably thought Mrs Butters was still powering the place. She would have handled Michael, Lucifer, Crowley et al. without mussing her hair. OTOH Larry Ganem was kind of a creep to leave her there all alone, although I suspect all of "her boys" actually viewed her as a monster and didn't consider her feelings for one moment.