Less remarked-upon is the kinds of systemic issues with public policy that led to the shooting in the first place: the breakdown of the US mental health system, and the ease with which people with intent to kill large numbers of people can get the weapons they need for that purpose. This has become the dog that didn’t bark in this tragedy. One of the victims of the shooting in Tucson was Gabe Zimmerman, a staffer for Giffords. His fiancee is one of the few to actually identify a problem related to the attack, and propose a solution.