Why I think you're wrong, TC.
1. Surviving a massacre doesn't justify it happening. Now yes, what happened wasn't a massacre, but even so, the point still stands. You surviving the unjust execution doesn't make it okay.
And I laugh at the rest of that one, because Ulfric totally had complete control over who got shoved in with his troops. He totally made the Imperials think this guy in rags standing off the side was just as much with him as the ones in Stormcloak uniform. Ulfric totally made that officer completely disregard the fact that the PC had done nothing wrong and send him to be executed anyway. That is just reaching.
2. No they're not. They're Nords, doing what Nord's do. And do remember what kind of people the US was founded by. Calling them scum just because they're rebelling isn't fair.
And no, you don't see Stormcloaks harassing a Dunmer, you see two beggars (who used to be in the LEGION) harassing a Dunmer.
A more accurate stance for what the Stormcloaks want is a land ruled by the people native to that land, (and dont' start with the whole Forsworn issue. That's a different issue localized to the Reach specifically, not the whole of Skyrim. Nord's are still native to Skyrim as a whole) not by people who live thousands of miles away and send puppets to deal with local matters.
Skyrim for the Nord's isn't a literal statement. Its an outcry again'st Imperial rule.
3. Because elves are deceptive, manipulative, and all around dastardly. They hooked onto Ulfric because they know what he can do and they pushed him to do it. But regardless of the Thalmor influence on the rebellion's beginnings, the rebellion WOULD have happened regardless. Ulfric had very little to do with to do with the people of Skyrim (who would eventually follow him anyway) being prepared to rebel against the Empire.
And no, just because the Dominion benefits from the rebellion doesn't make it a bad thing. The Dominion also benefits from being allowed free reign to go anywhere and do anything within the Empire's borders.
4. Presuming that was true, then that has to be the worst ruse ever devised in the history of fiction or non-fiction. How exactly do you build up the strength to counter attack (when you already had it back when you DEFEATED their armies) while not only letting your enemy build back up the army you devastated, but also while allowing their spies free reign to go wherever and do whatever they want within your own borders? Even if Mede was building up some sort of invasion, the Dominion would find out about it. You can't hide the forces for an invasion that easily, and especially not when you're letting spies go and do whatever they want.
5. A true warrior will fight and win regardless of what his opponent uses against him. A fair fight is something you do when you are at a play, not when the fate of an entire nation is in the balance.
6. Where you may or may not have come from doesn't influence what you should or shouldn't do. In reality it would, but this is a game. I can say I was the son of the Emperor and still join the Stormcloaks. An Altmer fighting for Ulfric.
7. Considering they end up in a stalemate with the Stormcloaks, I doubt it. Tullius' arrival did bring about a near end to the rebellion (and mind you we don't have any information on how exactly he managed to execute his ambush. It was a move that literally comes out of nowhere) but afterwords the war stalemates until the Dragonborn's involvement. Sure they could just send another Legion, but the fact that they'd have to do that at all says a lot more about the Legion's strength than it does about the supposed stability of the Stormcloaks hold on Skyrim.