I think calling the Alliance aggressors as far as back then ignores some of the framing of our being in Ala Mhigo. First part it being a plot to frame the Alliance by Ilberd when the alliance was okay with simply shoring its own defenses. Second part being that we would have backed out and gone back to doing just that if the native people denied us. We were very specific in the process of getting the permission of Ala Mhigans, that we would be acting as allies in the restoration of their sovereign nation against a foreign oppressor, rather than as an invasive force with a different coat of paint on it and just as importantly left it a sovereign nation when we finished its liberation.
Next up is the matter of Garlean international relations. We just found out that their attempt at making treaties was a big false flag operation to give an excuse to redouble their war efforts and silent dissenters and that they'd rather wipe a city off the face of the planet than loosen their grip further. That's not the actions of a country preparing to do anything but murder its neighbors. How far does Garlean aggression have to go before they're held accountable for their end of it?
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As a place with individual people I'm sure there are plenty normal, good citizens of the empire. But the way they handle business with other nations is just a checklist of every crime of imperial colonialism and by their track record that's not going to change by peaceful means because their leadership denies peaceful means and willingly kills those on the inside that try to achieve it.
With 4.4 I wound up pleasantly surprised by Varis being a true believer to self-determination while at the same time... "Oh wow you mean this violently expansionist, racist military regime was founded for the express purpose to do evil and sow discord? Whaaaaat?" which is what lead me to believe Varis was a fake. But it goes deeper than him. So there's hope, faintly. But he needs to drop his own hubris and accept the help of outside people, as Regula suggested.
Got sidetracked there, Varis being a true believer to the doctrine lends him to being a Fordola situation, and the revelation of Solus could be for him what the defeat of Zenos was for her. Shattering a worldview he was likely indoctrinated to at a young age.