What Knock Knock is really about (Spoilers!)

(SPOILER ALERT!)

Horror films historically have unmasked society's fears and anxieties. While Knock Knock is advertised as an "erotic horror thriller" I saw an underlying subtext from the beginning that was all the more unavoidable throughout the film: Open Borders

During the opening credits, a helicopter flies over Hollywood. We see the famous Hollywood sign from above, approaching from the front in which many dreamers have travelled from far and wide, to the other side, where most of the dreams become unrealized. Everyone is welcomed to Hollywood, but very few break through to the "other side" of fame and fortune.

Here we meet an idyllic family, a man who appears to be very successful at his work and has a loving wife and children. The wife is beautiful and perfect, an artist whose sculptures are a counterpoint to his rigid profession of architecture where creativity and exactness coexist. Though it isn't expressed in the film that I can recall, with her accent she appears to be an immigrant from another nation. This family is the American Dream of what a family where a family of mixed-cultures can live and thrive in harmony.

The wife and kids leave for a vacation that was originally planned for the whole family but the father has to stay home to finish a project for work. Isn't it ironic that the family is leaving the father home for a Father's Day vacation? What's also ironic is the wife and kids leave for a "beach trip." Most beaches, when seen from above or on a map, appears as borders.

Early one stormy evening, two very attractive young women appear at his doorstep. Both are exotic looking, with one of the girls speaking with a heavy accent. Whereas the wife is the representation of the American Dream, these two young women represent something very different. They stand at the door/border of the man's house, begging to be let in to escape the torrential downpour. Torn between his reluctance of letting two strangers into his house and sympathetic for their situation, he opens the door wide and invites them in.

Later in the movie, after he's given into the two women's seduction, he even drives them back to their home in the city. But after driving off, the two women walk away and laugh to themselves that this isn't their home, and soon to return to the man's house.

They make a return appearance to destroy the house the man and his family have worked so hard to cultivate: destroying the wife's art pieces, vandalizing his house, even destroying his prized vinyl collection. Isn't this the underlying anxiety one feels about open borders, that our culture will be destroyed?

Let me get this straight: My reading of this film isn't saying that open borders is or isn't a good or bad thing. I think the subtext of the film is only illuminating the fear and anxiety anyone, from any nation, would feel when strangers to their home/nation appear.