[*]It was not strictly necessary for Ulfric to end Torygg's life.
The moot literally cannot be called unless Torygg dies. The law came out of the previous war of succession which was caused by too much fueding for the throne
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[*]The Moot is not an adequate judge of who "ought" to rule Skyrim, despite tradition; whichever side wins has replaced dissent with Jarls of their own choosing.
"My way of judging is better than theirs."
[*]All Dunmer in Windhelm are employed and housed; Ulfric, according to a (what I consider to be outdated and misinterpreted decree*) does not "owe" them, but what the Dunmer are concerned about is more to do with the fact that they live in a (comparative) slum despite their earnings, and are subject to mistreatment on the part of the Nord ruling elite.
Guess what? There's nothing stopping them from hiring a builder like anyone else and repairing their stuff.
[*]Many assume that the Argonians and Dunmer in Windhelm would be at each other's throats, but this is not supported by dialogue in-game.**
** Dealt with later, also contradicted by Suvaris.
[*]Niranye's statement ("...too proud to understand the way things truly are...") is often, I feel, read incorrectly. Combined with the line above it, Niranye seems to be making a point about the profitability of illegal activity, not about the Dunmer themselves.
Regardless of Niranye's intention, one dunmer backs her up and owns a farm because of it(Where a nord even works). Another altmer owns a main establishment in the city. Ambarys says the murders aren't any concern of his until they take a dunmer. That is isolationist and seclusionist. If you don't think that attitude is helping cause this rift, I doubt anything can sway you. The cornerclub is the ground zero of the traditional morrowind sentiment which is by its very nature very anti-nord.
[*]I feel that to attempt to mitigate the downsides of either side is foolish and destroys the intent of the presentations of the factions.
Let's just say I despise character assassination based on "I think's" instead of actual proof. And an entire post that only tries to mitigate one side is disingenous.
Scouts-Many-Marshes: "Why do the Nords bother you so much, Ambarys?"
Ambarys Rendar: "Why do you even need to ask? They treat your people as bad as they do mine."
Scouts: "I think that's just their way. The Nords don't like anybody who's not a Nord, but they're not bad people, deep down."
Ambarys: "Look around you. Don't you know what their little war is about? They want all non-Nords out of Skyrim. That means you and me."
Scouts: "Oh, I doubt that very much. Who would load their ships, then?"
Ambarys: "Just you wait and see."
***
Ambarys: "How much do they pay you per day?"
Scouts: "That's really none of your business..."
Ambarys: "How much?"
Scouts: "Eight septims per day***, plus lodging."
Ambarys: "Eight septims for breaking your back, and then you live in squalor. How much is your dignity worth?"
Scouts: "If it's all the same to you, Scouts-Many-Marshes prefers to eat and drink in peace."
Ambarys: "Sorry, my scaly friend, you've come to the wrong place. Around here we don't ignore what's happening in the world."
Does not exist in game. Obviously so. It's cut lines. Or do you think Tullius knows Ulfric's right and wishes the empire would let skyrim go?
Aside from the above, there is also the relationship between Sondas Drenim (Drenim being an exclusively Telvanni name, according to Morrowind) and Derkeethus in Darkwater Crossing.
They have the leisure of not being cramped together in a tight living situation. The situation in windhelm is due to traditionalist dunmer clashing with traditionalist nords. Compare Riften to Windhelm. One of them has some dunmer that refuse to adapt to the culture around them, the other does not. Can you guess which one has problems with cultural tensions?