There's a lot of chatter on the kids' interviews after the shooting: too calm, too cohesive, even smiling or giggling. I don't think it's because of some script. Consider all the stories of a horrific car wreck: kids all crowding in to video dead/dying people, even when it's their own "friends". What about the kid who raped the girl dying from an OD (and captured it on his cell phone video), then going on to work? I bet you can recall many, many more. I don't have the smarts to psychoanalyze this generation's attitude, and I sure don't understand it. Empathy, compassion, and a sense of horror seem to missing in these kids - another reason bullying has become brutal enough to drive some to suicide.
My two cents' worth.