How we cite our quotes: All quotations are from Alien.
Quote #7
ASH: You still don't understand what you're dealing with, do you? The perfect organism. Its structural perfection is matched only by its hostility.
LAMBERT: You admire it.
ASH: I admire its purity. A survivor—unclouded… by conscience… remorse… or delusions of morality.
Notice that the qualities that the alien lacks, which keep it "unclouded," are the qualities we tend to extol in humanity. To Ash, the perfect organism is perfectly anti-human.