There's nothing to say about what happened out there.
It probably would have been better with actual mental care and restricted access to guns that allow one mental deviant to kill tens. At least his AK-47 jammed.
I'm not going to say any more. Look at the following links for more articulate responses. And those of the dark side: Fox News.
Gin and Tacos
Mike Huckabee blames sin
Bill O'Reilly: gun control wouldn't have helped
Bill O'Reilly: It's the parents of the six year old who are at fault
Just in here: Ezra Klein's terrific analysis of gun violence in the USA.