Thanks for finding the correct story.
Right, so fighting back means you have a chance to forcefully help determine your fate, but does not preclude you from being a victim. With that said, this notion of fighting back is not a new idea. There have been instructional videos on this distributed or shown to various districts for several years. Maybe fighting back is gaining steam.
BTW: There was an altercation between Adam Lanza and teachers at the school a day or two before the massacre.
So not completely random and he apparently killed three of the four with whom he had the confrontation.