A photograph is not just the result of an encounter between an event and a
photographer; picture-taking is an event in itself, and one with ever more
peremptory rights—to interfere with, to invade, or to ignore whatever is going
on. Our very sense of situation is now articulated by the camera’s
interventions. The omnipresence of cameras persuasively suggests that time
consists of interesting events, events worth photographing. This, in turn, makes
it easy to feel that any event, once underway, and whatever its moral character,
should be allowed to complete itself—so that something else can be brought into
the world, the photograph. After the event has ended, the picture will still
exist, conferring on the event a kind of immortality (and importance) it would
never otherwise have enjoyed.
— Susan Sontag, On Photography, Ch. In Plato’s Cave, 1977