The mother of the school shooter possessed a large collection of legally-registered guns. She trained her son in their use. The killings at the school were done with a semi-automatic rifle.

Her son had known mental issues.

He attempted to buy weapons, and was turned down. But he knew where to find them.

Unfortunately, his mother was not the only one to suffer from creating this situation.

The emphasis now seems to be solely on availability of guns. Nobody is discussing many other things that could also be issues. Glorification of violence in our entertainment. Neutralization of moral authority in our culture. Just to name two. I'm not saying these things should be harshly cracked down on any more than gun access, but there's a lot of space outside the "gun" box that is open for discussion.