Even when I first watched X3 for the first time, I thought, “What was the purpose of Magneto moving that bridge?”
Then, recently, I find out in a New Rockstars video and other sources that it was originally made for a scene that was a part of a different version of the film where the bridge was used to break Mystique out of Alcatraz, which had been transformed into a special mutant prison, and Magneto led an attack in Washington, D.C. on Worthington Labs and subsequently the White House. Then, Brett Ratner came on board at the last minute and got his greasy hands over it, had the script rewritten and decided that, for some reason, it would be a great idea to have Worthington Labs be the repurposed Alcatraz prison, which doesn’t make any sense because it’s a national monument protected by the government and can’t be owned by a private company. And, since they still had this whole bridge constructed, they didn’t want to get rid of it since they had spent so much money on it, so they just had a new scene written for it to be used for the final battle of the film. So, if you’re wondering why it’s in the film, that’s why.
What a f**king mess that film was. And we all thought, “Hey, this Fox X-Men can’t get much worse than this, can it?” Oh, how naïve we all were.