Too offensive. I'd play it, but just imagine all the soccer moms, teachers, church leaders, and especially survivors of the shootings and Columbine folk that would detest your manifestation. Making a video game out of a tragedy like that really is going too far, I think. If I would ever exploit a terrible time in history to make an awesome and bloody game, it would be the Holocaust. Just think about it, operating on Jews, gassing Gypsy's, it'd be epic but also extremely dark.