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Being 'about' 9/11 could be fine. The original Gojira was about Hiroshima/Nagasaki. And it's no coincidence that so much anime at some point features the slow-motion destruction of a city. (Although less so now than 20 years ago, it seems.)
I expect the film to be crap, because all of Abrams' TV shows have an intriguing set-up and then pointlessly unravel into nothing.