In law enforcement, my former field of expertise, we knew how important it was solve a crime quickly because as more time passes without a suspect, it becomes less and less likely that the case will be solved at all. In the medical world, where my husband once worked, getting a patient to the hospital immediately could determine whether the person lived or died.
A fast response is just as important in IT security. As this article puts it, "How quickly defenders can detect and respond to a breach can mean the difference between a nuisance and a nightmare." Read more here: