There's an understatement, I tend to think of them as elven supremacy terrorists. And it really is the Thalmor you know; NOT all High Elves in general, NOT the entire Aldmeri Dominion (two of its three nations aren't Altmer nations and have plenty of reason to hate the Thalmor).
How long as the Thalmor faction existed anyway? I know the Dominion was around in the 2nd era, and that the Thalmor was around as a faction that few people paid attention to before the Oblivion Crisis, but how long have has the group itself been around to cause trouble? --- "I'm feelin' peachy keen, so f%@& you, and thanks for asking ^/.^"