Why Detroit?

Why are terrorists flying to Detroit? I suppose the reason has something to do with the fact that Detroit is the city whose maps and satellite images are used for Raccoon City in the film Resident Evil: Extinction. (This is the third film; the second film, Resident Evil: Apocalypse, featured Toronto City Hall as the city hall of Raccoon City.) I saw a vid from a guy who eliminated Michigan as the potential site of Raccoon City, because there were no mountains. He forgot the Iron Mountains. He eliminated it because there were no clear accents in the residents speech, forgetting that only the Yoopers ( Upper Peninsula folks ) have a distinct accent. I suppose the tax credits available determined where the filming was done.