"I have sworn an oath to heal and to protect humans. Guns, invented to maim and destroy, are my natural enemy. Sally Cox, a school nurse in Newtown, told Scott Pelley of “60 Minutes” that when state troopers led her out of the school after the mass shooting they instructed her to cover her eyes. This was humane, and right. But some of us see every day what no one should, ever. If the carnage remains undiscussed, we risk complacency about an American epidemic — one that is profoundly difficult, but necessary, to watch, and to confront. That is why I bear witness."