What the Flag Smashers were demanding was that persons previously invited into developed nations not be forcibly relocated out of those developed nations. That's it. That's not an unreasonable ask: "Don't kick me out after you let me in."
And then what?
I agree! And the Flag Smashers were not organizing against having a formal process to help people post-Blip. They were fighting against marginalized people being further oppressed through mass level forced relocations.
And then what?
I see no evidence of that whatsoever. If someone organizes for Black Lives Matter, does that mean they don't care about equal rights for transgender people? The fact that the Flag Smashers are organizing for a specific cause does not mean they don't care about other causes, it just means that those other causes are not their focus.
That's a terrible analogy. BLM succeeding doesn't definitionally push the same wallpaper-bubble of oppression over to trans people. Racist police brutality isn't a shitty solution to a real problem that would then have to be solved in some other shitty way, it's an awful thing that can be excised from society without any cost. There isn't some racism monster out there requiring police brutality that would still need to be fed with atrocities against different people.
If you want to transplant this into the real world, look at the people organizing for total police abolition. Does that mean they think you should just be SOL if someone breaks into your house, or steals your bike, or beats you up on the street, or the traffic signals break at a major intersection? Frequently, yes, judging by how often I see that question answered with, "The police don't help victims now, so what's the big loss?" Not everybody thinks these things through as much as you seem to assume, and it's bad when you're so dedicated to solving the immediate problem you can't even conceive that your solution could have problems of its own.
The Flag Smasher's goal, by definition, is to make what had been their problem into anyone else's problem. Do you genuinely believe, based on her stated motivations and backstory, Karli Morgenthau would've been agitating for the returnees if
they were being relocated, in the new, borderless world, to the places that had been abandoned and forgotten by her friends during the Blip? I mean,
she wasn't the one who got on TV and gave a big speech about they can't look at the problem in terms of winners and losers, that the solution isn't to load all the suffering to the backs of the most disposable people, but for everyone to chip in and sacrifice a little, recognizing everyone is entitled to common human dignity and respect, and it's never acceptable for anyone to be written off as a problem and obstacle to be ignored to death, even when the person doing it is coded left-wing and not right-wing.
And the Flag Smashers are, it cannot be emphasized enough, trying to prevent what amounts to a genocide-level war crime.
Against them. They don't give a shit about any genocide-level war-crimes against other people that might happen, so long as they, personally, are taken care of. It's
in the text. "Zemo thinks you're a supremacist." "That's ridiculous, I'm not a supremacist, I'm just morally and physically superior to the corrupt international ruling class, have tunnel-vision about helping the people I'm personally sympathetic to, and have no concern or interest in out-groups to the point of dehumanizing them and only considering their deaths in terms of whether or not they'd give me a political advantage or disadvantage."