Mass shootings - like many other forms of gun violence - are a largely American phenomenon. Despite have only 5% of the global population, the US accounted for 31% of all mass shootings between 1966 and 2012.
The guns used in mass shootings are typically purchased legally... which only shows how it is far, far too easy for high-capacity weapons (many of which were never intended for non-military use) to get into dangerous hands.
Despite the opinions of some, there is no credible research to indicate that the presence of additional guns during a mass shooting - or whether a particular location is a so-called "gun free zone" - would serve as either a deterrent or save lives.
Around the time of the second anniversary of the shooting at Sandy Hook Elementary School, I had the honor of interviewing a few of the teachers and listening to their memories. The love for their students, their dedication, and their strength was palpable and overwhelming.