Well, may be there is more to this, as the suspect/criminal in question graduated from the same school. He might be carrying out some kinds of revenge. And that is where proper gun control comes into play. May God reposed the lost soul and give family fortitude to bear their loss.
βGunman who killed 61-year-old woman and a 16-year-old girl at a St. Louis school brought a long gun and 12 magazines, police say - CNNβ