I haven't played Morrowind, but I've read a lot about the story and the lore. And there's just one thing I don't understand. It seems like the Dunmer are better off with the leadership of people like Vivec and Almalexia. Why doesn't the Nerevarine destroy Dagoth Ur and help restore the Tribunal to its former glory?
Well Azura is vindictive bi@$#$...... So there's that. She doesn't care that the Dunmer are better off under the Tribunal. She just want's to get back at them for crossing her. End of story.
"
restore the Tribunal to its former glory" You need the heart to do that. And it's been freed from the enchanments holding it in place so there's no restoring them.
Oh and I'd say he didn't destroy the Tribunal. If anyone did it was Almalexia. Nerevarine only killed her in self defense.