Why did Adam, after killing his mother, travel to the school where she worked? Shouldn't some suspicion fall on the mother? She looks like a victim, but could she and her son have been operating together? News reports say the guns were "apparently" hers, and Adam was buzzed past security at the school because the principal "recognized him as the son of a colleague." If she was a "colleague" and had such a troubled son, why hadn't she conveyed this information to them? If she was staying home from work to deal with his problems, why didn't they know it? What were her issues with them?