The only reason XCOM hasn't yet called down the Eldrazi is that they haven't had a chance to. XCOM does "what is necessary to survive" exactly as much as the Ethereals did; the sole and lonely difference is that they're too small to do more and haven't been pushed far enough to produce such a grand idea of What Must Be Done. Psychic torture, insane psionic cybersoldiers, galaxy-spanning darwinian genocide, ultimate lifeform that they will then take control of, you name it, they'd do it and be happy about it. For fuck's sake, the capstone mission in XCOM 2 has them uploading themselves into the Ethereals' ultimate lifeform, and the plot ends with them questioning whether the guy in charge of XCOM is literally an Ethereal or not! The guy that literally ran the organization might not be human. Guess we have to purge him. I can't make this shit up.
I disagree with pretty much all of this. V, "the ends justify the means" is not an absolute state of affairs for most people. It's a spectrum of what they're willing to do under what circumstances. XCOM is motivated by empathy and a need to protect people, not by a need to conquer or control, and they're not motivated by xenophobia, either. And you do recall that the Ethereals tried to take the Commander over at the end, right? Because that's how I recall it playing out. Psionic clash for control, everything explodes.
Your entire argument feels incredibly fallacious and emotionally charged to me, which makes you calling anyone else out on it really weird. I can't name the exact fallacies myself, not having a strong education in them, but it reminds me of Slippery Slope or Black-and-White thinking. "XCOM did bad things in a war scenario under extreme conditions, therefore they will do it if in-charge of post-war rebuilding" seems to be the whole point of your argument, and I don't think it holds up. Because people do lots of sh*t under those pressures they wouldn't otherwise. If a person kills in self-defense, are you going to assume they'll do it when they're not threatened? If not, what's the difference between that and this? I don't see it.
XCOM currently does its mass-murdering by blowing up dams and office towers and hospitals rather than by building concentration camps solely because that is what is available to them. You bet your ass that they'll have camps the
instant they have the upper hand and can industrialize their extermination of everything on earth that doesn't share a common ancestor with them. They happen to hate "aliens" instead of "people with weaker souls" or "people with different skin", but it doesn't change the fact that they ape the Ethereals word for word. They're purifying the world of unnatural, abominable un-people in order to restore power to the rightful masters of civilization and perfect the species, and their mission is important enough that literally any action is justified no matter how horrifying it is. Read the fucking tech tree:
Article: Shen expressed varying concerns about the well-being of the Codex, as it appeared to be responding, and even resisting, our efforts to decrypt the data and access the ADVENT network. I assured her any indication of pain or active intolerance of our testing was merely a byproduct of the procedure.
Codex Brain
Does that sound to you like an organization that'd do literally anything to ensure that humanity was safe? Yes, no, maybe just a
little bit of mass torture followed by genocide?
...My dude, the Codex is a machine with no nerve endings or concept of pain. Also, XCOM works with the Skirmishers, aka guys who got alien DNA shoved into them, without wanting to purge them. So, no, I disagree with all of this. Any "purge" would come about because, even without the Ethereals guiding them, the aliens are aggressive (see the Alien Rulers and the introductory mission especially), and are basically living weapons at this point. Maybe some treaty might be reached with some of them, but most would just keep fighting, I suspect.
As for "galactic domination"... what the fuck do you think will happen postgame? Will XCOM ever be content staying on a single planet? When they go to build a colony and find out that there's already something on it, do you think they'll leave it alone? Or will they make sure it's not a threat? If we're talking about Ignition's XCOM, given that there isn't much space left in this plane, do you think that they'd just leave what they find alone? If they find a major civilization, something that could legitimately threaten an interstellar humanity, do you think they'd leave it alone? Or would they do whatever they have to do to "ensure humanity's survival"? Time break out the old psionic mind-ripper again, Dr. Vahlen, we have another species to psychoanalyze. We have to make sure they're not a threat. And it's not like they're particularly intelligent, right? Or, going back to Ignition's XCOM, say they realize that they're stuck on a decaying plane. What do you think they're going to do to ensure their survival? Start looking into alternate power sources? Start experimenting? Do some of the good old genetic augmentation, maybe with a nice dose of psionics mixed in? Because they'd already started on that track in-game, and again, I guarantee you they'd deal with an OCP by doubling down on what they know. Which is, given what they've learned from the Ethereals, a whole lot of really horrifying shit.
I think they'll probably get to work rebuilding things on Earth, maybe do some intergalactic travel once that's over, and treat any aliens they encounter carefully until they know where they stand with them, and if an alliance is feasible. Again, I think we disagree about what the main motive that drives XCOM is (xenophobia vs compassion and empathy for the people the aliens have harmed), and I don't think either of us can know we're right without meeting Ignition's XCOM.
So yes. XCOM is the Imperium of Mankind writ small. You know as well as I do that XCOM would set up an Astronomican in a heartbeat. The awakening of the Chaos Gods as a result of the disturbance of the Warp is a hilariously apt parallel to the way the Ethereals attracted the Eldrazi and you bet your ass that XCOM would do shit that'd wake the Chaos Gods up if they thought they needed to exterminate some xenos. XCOM is what the Terran Imperium would be in a less utopian setting. It would do anything to ensure that humanity survives, and it believes that a preemptive offense is the best defense. It's humanity's version of the Overmind, its Ur-Quan Kohr-Ah, its Ethereals.
Yeah, again, no, that's, like, your opinion, man. You're stating your interpretation of events as fact. It is not. And you lack the data to back any of this to the degree you would normally demand other people back their claims. Your one citation was without context and incredibly weak with it. You're capable of more coherent reasoning than this emotionally charged, violently vitriolic argument, and I'm really not sure what the hell is driving any of this, because it reads like you're more pissed off than a Red Sox fan would be if/when (I don't do sports-ball much) they lost the last game of the World Series, pre-Bambino's Curse being broken. Calm down, or just stop discussing this, because I am genuinely worried about your health if you continue.
Wait what
...I don't remember that scene...? ._. They basically worshipped The Great Commandy One to the very end. Is that something from The Bureau?
See above. If memory serves, they weren't quite certain who won the final psionic showdown between the Elders and the Commander at first, and who was in his body.
Anyway, as far as Jade knows, XCOM has some serious issues with how they treat their enemies and those who seem to knowingly help them, but being bloodthirsty genocidal maniacs is not one of their issues. Aside from ADVENT propaganda, they don't go after hospitals, gene clinics, dams, or other civilian targets.* The closest they get is destroying the occasional armament factory with some civilian technicians, and even then, they try to wait until after hours and make a good-faith attempt to evacuate civilians.
*One of their other problems is that they don't seem to consider important technicians or officials to be "civilians." They do brief captured VIPs on some of the worse ADVENT activities and give them a chance to join after being more well-informed, but if that's turned down, the results aren't pretty.
About what I expected. So yeah, they're not much like what V is describing. Maybe they have a bias against space aliens, but they might not, too.
Edit: Okay, to be fair, stuff does get destroyed during firefights in cities sometimes, in-game, and civilians do sometimes die in the process. And some players might be rather cruel with mind-controlled enemies, like having them chuck grenades at their own feet, or using those orb guys to revive dead civilians as zombies. But it's not exactly much worse than any urban firefight with the weapons involved might be expected to be, and it's also XCOM troops fighting for their lives. Sure, I've accidentally killed a civilian or two with grenades during XCOM, or, far more often, gotten them killed because they were too close to my troops and the aliens used an AoE attack. But that's war for you: sh*t happens.