Crazy People + Weapons --> should not mix. Keep the Clinically Mentally ill and/or handicapped from guns and other weapons that could lead to mass killings.
Those people who want to use all these crazy people with guns to ban them are just as insane. Its seems to me that we are having a spiritual/mental health crisis, not a gun control crisis.
The dude's psychologist knew he was dangerous and warned the university -yet he could order ammunition online.