I didn't know anything about the incident before watching the film, which is now a few years old. Nor did I realize the "actors" were the actual participants playing themselves.
Here's thepoignant thing I took from the film. The young man who kept trying and failing at several occupations, who said he felt that life was pushing him in a certain direction....I think about what would have happened had he succeeded at the first job? He never would have gained the skills he needed to overcome the terrorist. It's a great reminder that even our failures teach us something useful.