When I was at the theatre to watch MI:III the other day, I saw two previews for movies about 911. I don’t really think I could watch a movie about that day. I didn’t have any personal connection to the events, but I just don’t think experiencing that day again amounts to any kind of entertainment.
I guess the movies can provide an easy-to-digest “historical” record, so they might be informative for people who didn’t experience everything first hand (or as first hand as watching it live on TV can get). I wonder if this is how some people feel about watching movies that deal with the Holocaust or the Vietnam War.