"Not every gruesome photo reveals an important truth about conflict and combat. " This is true of course but different things resonate with different people. The photographer in this case says that he could “see clearly how precious life was to this guy, because he was fighting for it. He was fighting to save his life to the very end, till he was completely burned up. He was trying to get out of that truck.”
Being able to look at the face of death is surely more powerful for some than scenes of corpses which become almost abstract, so desensitised are we.