And Innocents won't die under the NCR? lets remember they roll over territory and claim it as there own regardless of what the people want. The conflcit between House and the NCR is 100% the NCR's fault. They decided that Hooverdam wasn't enough they must claim the entire Mojave for themselves. If there expansion isn't halted eventually they'll piss off one to many people and thats it.
You can literally get a peaceful ending for every single faction (except the Legion, of course) if you make the right decisions and let the NCR win. The only people who suffer are the Powder Gangers and the Legion, and neither could be described as innocent. Hell, even the BoS can be pacified. Not arguing that NCR is better as they are marching into the Mojave and basically jamming democracy down people's throats, but I am arguing that no, it doesn't seem like innocents will die under NCR.
House saved Vegas from destruction, he set up the Casinos. By what right does the NCR have to take the Mojave for themselves? The Kings don't like NCR's intrution onto the resources in Freeside hense the conflcits.
First off, saving someone or someplace from total destruction doesn't mean those people owe you; it means you're human and you did what any good human would do. If anything, saving Vegas just shows House's qualifications and what he's capable of. Second, the Kings don't have anything against the NCR; Pacer does. Without Pacer's interference, the Kings would never have a problem with the NCR.
We don't know why Vault 21 was filled with concrete so it can be hard to judge. One could argue that a vault full of compulsive gamblers smack in the middle of the strip was doomed anyway. They gambled away there vault. What does that tell you about the residents? That they'd have lost everything anyway. Still doesn't explain why he filled it with concrete though.
True, we don't know why, but that to me seems the most logical. I also think Doc Mitchell makes a comment that seems to suggest that this is why. I mean, it's a vault full of people with Agoraphobia who have never known anything but their vault; where else are they gonna go?? Fill the place with cement, force them out, and they're likely to stay nearby rather than brave the wastes, and then you're free to tell them what to do. And Vault 21 is described as being highly successful, not doomed. How would living in a sealed Vault in the middle of the Strip doom them? It was House that forced them out of their vault and onto the Strip to work; they were doing fine and were far happier before he arrived.
Here's the other issue House actually has a plan to rebuild humanity. The NCR is overstretech, the legion is going backawards. But House actually has an idea to save humanity.
I'm not arguing for NCR, but I'm saying House definitely has his flaws too. Perhaps he is the most promising for the future, but that doesn't change the fact that some of the most innocent citizens of the Mojave will suffer under his rule. (Vault 21 already has, the Kings and the Followers will, Primm and Goodsprings seem less than happy with him as well.)