I guess until we know more about the facts of the matter of the shooting there will only be opinionated expression (not intended as a negative comment) affected by one's personal view of guns (also not negative).
The criminal element has proven throughout history to be an uncontrollable element. Yes stronger rules and filters regarding gun ownership will help but will not eliminate those who want a gun allowed to or not.
Our current permissive stance on so many issues all aimed at not hurting someone's feelings or the alleged abuse of personal freedom is a perfect environment for those intending harm.
THe lack of enforcement of the existing laws is a major contributor to gun violence. This lack of enforcement is the catalyst for many other ills that currently plague this country.
We are controlling buying a big big soda or what not to say to offend some one!
A shift in priorities and some spine would go a long way.