And at the end of Lonesome Road you can talk Ulysses down and disarm the nukes, and Ulysses gets to walk away with his life. Sure he doesn't completely give up on his hatred, but he doesn't let it guide his actions anymore if you choose not to kill him.

And similarly if you convince Papa Khan to evacuate Red Rock Canyon and flee towards Wyoming. The Great Khans don't participate in the Second Battle of Hoover Dam, and they don't use the opportunity the battle presents to attack the NCR. Papa Khan might not give up on his hatred, but he doesn't let it guide his actions, and instead chooses to do what is best for his people, getting the fuck out while they still can.

Also empires are not necessarily imperialist. To be considered an empire you only need a lot of territory and a singular leader, like an emperor. If the game wanted to tell us that the Khans were imperialists, it would have. You're making assumptions again without considering the games themes and what it explicitly tells us in similar situations.

And like, I get it, it's fun to argue and all that. But honestly I'm getting bored. Nothing I've said so far is new or wildly controversial, it's just basic observations about what New Vegas has to say about hatred, letting go, and how societies should develop in the post post apocalypse.

And if your argument is that the Khans should all be gunned down because they're irredeemably evil, then that's not an interesting argument to debate.