Read a relevant book several years ago (fiction) by Jodi Picoult, NINETEEN MINUTES. It is about the dynamics of a teenage school shooter, the kid who had been teased, and bullied all of his life to the point of complete despair and breaking point. The most interesting relationship was between the mother and son. A really good read for today.
Another really great fiction read on the subject of a school killing is “We Need to Talk About Kevin”, by Lionel Shriver. It too was about the relationship between the mother and son.