A lot of them, the presence of a school was either incidental or completely irrelevant to the shooting.  Hell, let's just go down the list...   Suicide outside a vacant building.  A vet with PTSD who called police to report himself being suicidal shot himself after the police tried to talk him down.     No one actually knows what happened - the bullet pretty much came out of nowhere, went through a window, the back of a bookshelf, and into the binder.  The binder was