"Humans Only!:" Outer Space and Spacial Restriction in Alien Science fiction

In 2009, the film District 9 was released. The plot involved the arrival of a large ship of refugee aliens, referred to in the film derogatorily as "prawns," in Johannesburg, South Africa in 1988, and the aliens' immediate sequestering in District 9, a bleak shantytown. The plot was inspired by the events in District 6, Cape Town, during the Apartheid era, as well as various other forced relocations and segregations throughout the 20th century. The original short film that District 9 was based on, "Alive in Joburg," took interviews with South African citizens concerning their opinions on the arrival of Zimbabwean refugees and placed it in the film in the context of the arrival of aliens. Similar interviews were used in the first teaser previews for District 9.

There are many interesting points about District 9 to be critiqued and expanded on as it relates to race, labor, and migration, but what I found was most interesting  was its viral, immersive marketing campaign, aptly named "Humans Only."

The 2010 British film "Monsters," whose plot was about giant cephalopodic aliens landing in Mexico and prompting the quarantine of the northern half of Mexico and the erection of a massive wall across the United States' southern border would utilize a similar "world building" ad campaign focusing on the restriction of the "quarantine zone" of Northern Mexico. 

Both films feature human panic, prejudice, and overreaction in the face of the arrival of an "other," and both ad campaigns utilize the idea of the restriction and illegalization of spaces as adaptive to the presence of the "other." Why is this?

Restriction of space and forced relocation has long been a means of controlling and criminalizing the very presence of individuals deemed 'undesirable.' When one cannot outright name an individual as 'illegal' because that individual is a vital part of a complex system to exploit them, one restricts the spaces where that individual is able to go in order to maintain that the individual remains in their place of exploitation and marginalization.