Last Friday, a gunman walked into a midnight premiere of The Dark Knight Rises in Aurora, Colorado and opened fire, killing at least 12 and shooting more than 50. Tragedies like these follow a familiar cycle. Because they are disruptive and out-of-the-ordinary, they receive an abundance of media coverage, which in turn gives life to stalled agendas while birthing new ones. The president addresses the nation, articulating feelings many people share. We mourn the victims, even though they are strangers to us. We ask why it happened, and what can we do to keep it from happening again. And as Ed Krayewski observes, we have been doing all of this for a very long time.