This put me in mind, when I later reflected on it, of the way in which so many Trump supporters seem to hear certain truths, and often reassurances, beneath or within the cavalcade of outright lies he delivers on the daily. The idea of an appealing truth that's deeper than facts seems especially dangerous in the context of the film, since Aaron elects to lie to Sara, late in the game, about his very nature, even after starting their relationship with honesty about his history as a serial killer so pure that Sara, a la "American Psycho," finds it impossible to believe.
Aaron's decision to reassure Sara that he's harmless precisely so that he can move closer his violent goal -- which I'll leave viewers to discover -- smacks uncomfortably of the current president, who seems willing to say, and unsay, anything to keep things going his way -- to double down on falsehoods in such a nihilistic way that the whole thing, much like "Creep 2" itself in the end, feels like a waking nightmare.
Oh, and what's mumblegore, you ask? Take a gander.