I live in Omaha, have worked retail at Westroads for years (though not currently), and my mom was actually there at Younker's when this happened at Von Maur. (She's okay.)
All I have to say about this is that we need to (a) pull it off of the tubes where it's talked about constantly, (b) take it off of the radio waves where it's talked about constantly, (c) take it out of the newspaper where it's talked about constantly, (d) not fear going out and doing normal things like going to a mall or going to school today, and (e) focus all of our busybody energy on compassion for the young people so lost, confused, and downtrodden that they would snap and do something like this.
He was mentally disturbed, his family knew he was depressed, they knew he was a total gun nut, they knew he possessed guns for which he didn't have a license, they knew his girlfriend broke up with him, they knew that he was fired from McDonald's that day, and his friends knew he was planning on doing something like this. Furthermore, he'd been in and out of foster homes, quit high school without getting a GED, had several visits to court for drug and disturbance charges, his family had kicked him out, and he had no plan for his future except shooting guns. After losing the girl and the job, he had nothing else left to lose, he had no support network, he had too few positive role models, no experience coping with his stresses (aside from self-medication and shooting his guns), and clearly lacked the rational, sane thoughts that keep us humans from going postal like this. THEY SHOULD HAVE SEEN IT COMING. And they should have done something about it.
This is why we need healthcare to take psychological/psychiatric care more seriously, and why we need it health coverage to be widespread for those under the age of 21.