I disagree that they didn't have any choice but to sign this agreement. What about Hammerfell? When they signed off part of their country as part of this "agreement" they, rightfully, said "hell no". There's no reason Skyrim shouldn't do the same.
Of course they had a choice: die with certainty soon, or maybe not die later. They made the right one, imo.
And Hammerfell is still fighting. And losing. The Redguards are the most talented warriors in Tamriel, and even they won't be able to stop the Aldmeri onslaught. The Empire did the wise thing by signing that treaty, at least now they can rebuild their strength and boot the Aldmeri back the way they came. This won't end until the Crystal Tower falls.
The fact that the Empire is allowing these killers access to prey on civilians with really no recourse goes to illustrate that this group of leaders no longer represents the interest of those it claims to rule. I do agree that this treaty won't last, even more reason to have not supported the sham. I'd say you're better to die fighting for that right to be free than bowing to the enemy and allowing their secret police access to your people while awaiting a slow descent into irrelevance and concession.
I agree about the Thalmor rounding up civilians, it's despicable. But it's something the Empire won't be able to do anything about until they regain their strength: when the Stormcloaks stop crying about Talos and do the sensible thing for once. Unite, boot the Thalmor out of Skyrim, Hammerfell and Cyrodiil, drive them from Elsweyr and Valenwood and chase 'em all the way to Summerset Isle if need be. That's the only way this war will end, which is something Tullius himself acknowledges at the end of the Imperial questline. That, however, is impossible with everyone fighting because they feel butthurt.
You're better to die for your right to be free, you say? Perhaps. But if
everyone dies for their right to be free, nobody will be free. And the Dominion will have won.
I get the impression that the ban on Talos worship was the icing on the cake. I think it's reasonable to understand whey they object to the situation. You plainly have a deeper grasp of the lore than I, but I think you're presenting a pretty one-sided view.
That's pretty much all the Stormcloak rebellion is, though. People were feeling unhappy about Talos worship being banned and Ulfric, as many people in-game state, "only cares about Ulfric". He wanted his crown, so he united the people tired of the Empire under his banner and went to war. It didn't help that many people shared his anti-Dunmer (well, basically anti-everything) sentiments, either. The ban was the only thing the Nords really had anything to complain about: before that, the Empire was as much part of the Nord's culture as mead and axes. It wasn't the oppressive entity the Stormcloaks forced it to become: it was just there, in the background. It was an idea.
And I dunno, I kinda like discussing shit like this. :lol It's more entertaining than discussing my own national politics, that's for sure.