Johny_X2 said:
I've gotta say that's a pretty silly way to look at things, silly as in humorous. It's essentially the same type of argument the Wolf gives in the childrens book that tells the Wolf's side of the story in the fable of the 3 Little Pigs. "I wasn't going around blowing down houses and gobbling up piggies. No, I was trying to bake a cake for my dear sweet grandmother but I needed to borrow some sugar. I had a mighty bad cold at the time, prone to big sneezes. And a couple of my sneezes knocked down a couple houses. It'd be a waste to leave a half-dead pig laying in a pile of rubble so I gobbled him up."
The point is that you lack context. Taken purely from the first film, you can kinda make the argument that you are: that the Alien is just doing what it does to survive. But you have to think of the Alien life cycle. As you mention, it's very birth requires that a life be sacrificed. It's birth ends with the death of something else. It's an apex predator, most assuredly a carnivore. It has no interest in talking about peace, sorting out some misunderstanding that they could all laugh about later "Yeah, sorry about popping out of that first guy. But ya know, he shouldn't have got so close to my egg. Can we just put this behind us and move on with our friendship?"
Again, you lack context, but this is hinted at in the first movie. The entire reason that Weyland-Yutani Corp. wants to get their hands on one of these things is so they can breed them and start making them into biological weapons. They didn't want to capture and study them because of their marvelous social skills and good manners.
According to lore established in Aliens vs Predator 2 for the PC, an alien drone in the absence of a queen will go into hibernation and begin molting. It's exoskeleton becomes much harder as it goes through a type of mutation that ultimate gives rise to a Praetorian-class Alien. If one of these survives long enough (and if a queen still has yet to rise) then it will eventually morph into a new queen. This is how new hives are established. One piece of lore that the series has always held onto is the fact that if a hive were to be established on Earth, it'd essentially be the end of the world. The Xenomorphs are far too cunning, reproduce far too quickly to be put down if they're allowed to establish a foothold. Based on this lore, the reason the Alien goes into survival mode is the instinctive drive for it to molt into a new queen and establish a new hive...obviously it can't do this once it's dead. And that brings up the notion that you lack context for: a full-blown infestation.
What it comes down to is that, since you haven't seen the other films, you're rooting for what you see as the underdog. 1 Xeno vs a group of mean, nasty humans. Well consider this: the alien is more than adapt at hiding and stealth. If it didn't want to be found, didn't want to kill, it very easily could have avoided the crew on that ship. If you watch Aliens (second movie in the series) it will become clear that by slaughtering everyone in sight, they're just doing what Xenomorphs do. Anything that can be captured is taken to the hive for a good ol' face-hugging (which leads to death), anything that fights back becomes food (which leads to death as well). It's just their lifecycle, they're an insectoid race, after all. When a hive is present, the Xenomorphs will actually launch raids, the way ants in a forest march en-mass to scour the forest floor for food to bring back to their ant-hill, so too does a Xeno hive vacate en-mass to bring more bodies back for food and implantation.
It was a unique thought you had, but like I said: it just lacked context. Trust me, Aliens were specifically designed by whoever thought them up to be an unstoppable horde of death and terror.
Edit: In short, watch the 2nd movie and tell me if you think your theory still holds water.