Physical checkups are performed on students every year to ensure the health of their bodies, so how come we are not ensuring their mental health as well?
Mental illness is often cited as the main reason as to why people go on shooting sprees. If psychologists in schools could identify the kids who are at the highest risk for mental illness they could make sure that those kids get help before their illnesses get out of hand. Just imagine what could have been prevented if the shooters of Columbine, Virginia Tech, Sandy Hook, and Aurora had received such help.
Stop the violence. Make it required for schools to checkup on the mental health of their students.