here is an interesting article.
Some argue that the economic reccesion is linked to the mass killings. It appears that stress and a seemingly ruined life is the primary motive to the killings. For example, a guy got divorced, lost his job and his beloved dog. He wants revenge and on christmaas eve, he goes to his ex wife's christmas party and open fires on the guests before gasolining the house to burn it down
Killing nasty people in the world doesn't help. They will be replaced. If guns were outlawed, they would just find some other way to kill. I say they need to find better ways of helping those kind of people get through their problems rather than take our constitutional rights away.