I been seeing this over and over and over..... All the allied race threads, BFA lore threads..... Alliance players keep saying "well I saved suramar" talking about the Nightborne or Thalyssra.
SO I thought I'd clear it up: What is reflected in-game does not always portray the cannon story that is the back-bone this 20+ year franchise.
WHEN AN EVENT HAPPENS IN GAME THAT BOTH FACTION PLAYERS PLAY THROUGH IT'S FOR GAMEPLAY SAKE. BOTH Alliance and Horde Player-Characters get an equal game-play experience for a customer based product. SO for GAME-PLAY sake we all get the experience.
A small investigation in to the story and lore will give you context. Sometimes its Horde cannon sometimes its Alliance cannon... In this case.....
According to cannon lore it was a "Horde Champion" that did what our player character did.
So Alliance players you DID NOT save Suramar. Your faction partially helped along side the Horde, while the Horde champion was the one to do the player character action......
That combined with the haughty pride of the Night Elves pushed Suramar to the Horde. Alliance stop acting like you're the pride of suramar now a enemy...