The Alien in Alien crawled around and hid in the walls. Cameron's Aliens acted pretty much the same, except they acted with more purpose, whereas the Alien Xeno didn't. It only seemed to go after Parker and Lambert, Dallas and Brett just ran into it (accidentally and purposely). I don't see them as being compared to bugs as an all out bad thing. People hate bugs, they're the most alien (lowercase 'a') looking things, with multiple legs and eyes and cannibalistic mating habits.