I'm playing trough morrowind for the first time and in one of the first quests you get the nerevarine cult notes. This is a part of it:

"The Temple honors Saint Nerevar as the greatest Dunmer general, First Councilor, and companion of Vivec, Almalexia, and Sotha Sil, who united the Dunmer Houses to destroy the evil Dwemer, the treacherous House Dagoth, and their Western allies at Red Mountain. But the Ashlanders say Nerevar promised to honor the Ancient Spirits and the Tribal law, and that he will come again to honor that promise. To the Ashlanders, this means destroying the false Temple and driving the Imperial invaders from the land."

Why were the dwemer called evil? I always thought of them as pretty decent People with as weakness that they wanted power a little to much.

And another question i was wondering about, when the dwemer disapeared how where they all in one place (exept that one that was in another realm) there should've been dwemer in other parts of the world that should have survived right?

Edit: hope the anwers aren't to related to the main quest, i have yet to finish it