The absurdity of it is what would bring people together. An unknown alien and interdimensional threat that would take years and years of cooperative research to even begin to understand how it was possible, all this while the threat of another attack would be looming at any moment vs oh no the American blue guy we have a decent understanding of that did war crimes did another one.
Though my view of the ending is skewed from the HBO one because they make a pretty good case for why the comic ending works.
6 years ago is a lot of time for internalized opinions to manifest. Especially now with how much ideology is thrown about and available on the internet and the state of the country, people who used to think “lol politics don’t matter” are slowly realizing otherwise.
Furthermore 6 years is way before pre-trump rightwing radicalization so someone who had fascist tendencies internalized may have been much less vocal about it until fairly recently.
Hell 2020 alone brought a lot of internal racism to the surface in otherwise dull politically parts of the population.