Really? I didn't know it changed our world.

What about such photos as those taken of the dead during the US Civil War? Or the one of dead American bodies washing ashore in the Pacific? Or the one of the execution of Vietcong leader during Tet 68? Or the one of the young girl, naked and napalmed, running down the road in Vietnam?

What "changed the world" was not the picture, but the reaction to it by the US government.