As far as I can tell it was and always has been. Due to people who are unfamiliar with guns chooses to own one and not take precautionary steps to make sure that the people around them aren't a danger to themselves or others. Also due to the fact the many of our streets are filled with gangs who obtain them through anonymous sources. There are just too many factors. I mean how come our government can spend billions and billions on "DEFENSE" every year and these kind of tragedies are still happening? What exactly is that "defense" for. For all I know we already have enough terrorists' in the u.s. then there are in afghanistan or iraq.