Poopypeanuts also did one about Katrina Disaster (Which Monkeyman also stole) and about the Virginia Tech Massacre.
The Katrina one was alright, since it dealt with looting in the aftermath of it and was fairly long. The V-Tech one wasn’t quite as good. It was short and just had you in the role as Cho.
Anyway, a story like that wouldn’t offend me, but then again very little does. I would imagine you're not really going for pure shock value/offensiveness given that you're doing a story about trying to stop 9/11 so I don't see the problem.