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The community of the Nostromo isn't made up of family, friends, or neighbors, but the far more perilous, far more volatile community of co-workers on the job.
Brace yourself, Shmoopers, for some serious inter-office politics.
The Nostromo's crew is there to do a job and get paid: in other words, they're motivated by self-interest, although that self-interest quickly shifts from lining their space wallets to staying alive. Is this a crew of individuals, or are they going to be able to work together and triumph? Let's put it this way: you can't spell Alien without "I."
The alien helps equalize the community of the Nostromo. When everyone is worried about survival, everybody is equal.
There are several clues that Ash is not part of the community of the Nostromo, like when Parker asks him to get out of his seat to Ash eating away from everyone else at the dinner table before Kane's death. Then again, maybe he just didn't want to be in the splash zone.