The mages of Dalaran held many Blood Elves prisoner under Garithos' orders Sylvanas wouldn't have liked that. Gilneas betrayed the Alliance and later left Lordaeron refuges to the scourge instead of opening the gate at the wall (and some of their own people(Curse of the Worgen)). Southshore has always been a pain in the ass and was the only Alliance held port capable of being used as landing for an invasion(The Stormwind fleet landed their after the First war). Ill give you Arathi. The Scarlets burned more villages and killed more people than the Forsaken ever did even burning ships bound for Theramore and Stormwind (Warcraft Legends).