One week ago, a New York City man named Ki-Suck Han was killed after being pushed onto the subway tracks by another man who has since been arrested. Right before the train fatally struck Han, a freelance photographer who had just walked onto the platform snapped several photographs of the impending tragedy. The next day, the New York Post published one of the photographs on its front page. The result was widespread outrage. But why? The Post did not cause Han’s death, nor did it hasten its arrival. And the photographer was not snapping shots with profit in mind. Instead, since he had no way of physically saving Han, he thought making his flash go off in a flurry might signal to the train conductor to slow down. …