EDIT: I see my post is being downvoted. I know that it may come across as insensitive to immediately leap to the gun control debate, but frankly I'm more angry than upset by this news. How many times does it have to happen? We have a good 48 hours of emotional outpouring and then everyone forgets it ever happened.
Was the Oklahoma-city bombing a wake-up call for "explosives control"? Was the 2009 Chengdu bus-fire (http://en.wikipedia.org/wiki/2009_Chengdu_bus_fire) a wake-up call for diesel control? Was the Osaka school massacre (http://en.wikipedia.org/wiki/Osaka_school_massacre) a wake-up call for knife-control? Was the 2012 Toronto mall shooting a wake-up call for gun-control in Canada, which already has extremely stringent gun-laws?
It's all too easy to blame the gun in these situations, but guns are just tools, as are knives, and diesel fuel, and even explosives.
It's not the gun. It never was the gun. It's the person.
The problem is how we treat mental illness. It's so stigmatized that people feel extreme shame and a sense that they just have to want to be better.
Every single person should be able to walk into a doctor's office, be screened and treated for their illness without the stigma that we attach to it. "Why should I have to pay for it?" This is one, among many, of the reasons. Will it eliminate these incidents? Nope but the result will still be a better society.