Armed police officer (or equivalent) in every school. About $400/yr per student or 3% to 4% of total spending per student.
The Mother should have know her son was a threat-—but she paid the price for her ignorance—she should have gotten rid of all guns. Society should have known he was a ticking timebomb—his doctors should have known, his teachers should have spotted him and had him placed in a Mental Hospital. This man was a danger to society and himself! Society needs new mental hospitals! These nuts will continue to kill until we provide them with the help they need. This was done once long ago. ALSO—violent video games must be blamed in part—for de-sensitizing people to a point they could kill the innocent without flinching. So too our violent films and Tv shows. We need a new Hays Committee to limit the violence—it is a pornography of violence that will turn the weak minded into killers.