donnie darko and 9/11

I was thinking about the movie, and how it was forbidden to play at the cinema because of the tragedy that happened around the time it was supposed to be ready for the public.
If the reason was that a jet engine crashed Donnie's house, and that alone, I think the cause is so small and does not have a clear perspective of things.
In the movie, the main character stands alone against time, death, illness and a hostile world. And what he does, besides battling for his life, is giving it for the things he loves.
Maybe this is what some people didn't want to get out of their heads, this is not necessarily a bad thing. He mends the relationship with his mother, he falls in love, he grows closer to the things he should, and he dies with a smile in his face, knowing that what he did was the right thing.
It's when you take someones life that all goes to hell.