Originally Posted by
Rilec
First of all, everyone saying "Lordaeron belongs to X and Y has no claim!" is pretty childish and wrong. The Forsaken and humans are two powers who don't recognize each others' laws. Both sides have what they believe to be a legitimate claim to the land and to each side, they're right while their enemies are wrong. The Forsaken are largely comprised of the dead of Lordaeron, raised into servitude and later set free to try and make an existence out of whatever husks of their former selves they had become. They take up residence in the land they once had during life, zealously defending the only home they have against human invaders who would stop at nothing to take everything from them. Lordaeron is currently the only real place in the world that the Forsaken have.
On the other side of the coin, you have the humans. Many of them were once citizens of Lordaeron in one way or another. Some are refugees who's family lines were born, lived and died on those lands. Some are old Stormwind refugees from the first war who's sister-nation Lordaeron took in and offered a home for many, many years. They struggle to reclaim the birthplace of the Alliance. Some fight to reclaim their homes from what they see as an abomination. Others fight to try and restore the homes of those who gave them refuge in the past. Both sides here obviously seem to have very legitimate reasons for trying to control Lordaeron, but all it really boils down to is a simple "I want it". There are no rightful hands for the land to be in. The Forsaken currently control Lordaeron, so it's theirs. If the Alliance were to take the city, the sides would change and they would be the "rightful rulers" while the Forsaken would be "invaders".
Now the out of game reason is because Blizzard hasn't done anything to endear Stormwind to the players. It has and continues to exist as a generic backdrop for humans and the Alliance as a whole. Even now, Stormwind and the Humans are a cheap, bland and empty wrapper hastily put around the alliance and a lot of people know it. A lot of Alliance players are desperate for the nostalgia of Warcraft 2, the amazing symbolism (the stylized L is infinitely better than stormwind's baby's-first-kitty) and a rich story. That's likely why you see so many ranting and raving on the forums about reclaiming Lordaeron.