It ought to be a shock to all of us, as a nation and as a people. It ought to obsess us. It ought to lead to some sort of transformation. That's what happened in other countries when they experienced similar tragedies.
In the United Kingdom, in Australia, when just a single mass shooting occurred in those countries, they understood that there was nothing ordinary about this kind of carnage. They endured great heartbreak, but they also mobilized and they changed. And mass shootings became a great rarity. And yet, here in the United States, after the round the clock coverage on cable news, after the heartbreaking interviews with families, after all the speeches and all the punditry and all the commentary, nothing happens.

Barack Obama, Memorial service for DC Navy Yard shooting victims, Sep 22, 2013