Refugees who were given free land by their old enemies, when the Dunmer themselves had fought Nords for such disputed areas as Solstheim. What did the empire do for the Dunmer after Vvardenfell? What did anyone else do but the Nords? Most of the Dunmer are making the best of the situation and will tell you they are trying to earn respect by working hard, and the Altmer in the city also own property and businesses. It's wartime so of course there's unhappiness and tensions are stirred up. But it's not "OMG Ulfric is a NAZI."
Others have already addressed him being a "murderer." He's not only honorable, he's a bloody hero.
Nazi ? What have nazis to do with Ulfric ?
Besides that... Skyrim was PART OF THE EMPIRE when the Dunmer came along. So the King of Skyrim was subjet to the Emperor, and so, he let other Citizens of the Empire to be tanken as refugees.
We are not speaking here of a crazy mass killer. We are speaking of a murderer, a bandit who usurped the throne, disguised as a Nord Tradition, in the worst moment even imaginable