Let's stop right there. A photojournalist had been apprised that a package left in a public place contained a time bomb. He was waiting, his telephoto lens carefully focused, for someone to approach the package and get blown to pieces. The only question on his mind was whether he would be quick enough to get the moment of detonation, and not the smoke-covered aftermath. A decent journalist will try to resist this process, for the good reason that a conscienceless hack won't produce much that is truly worth reading.
Photographers go through the same sort of process, only at a more drastic and exacting level.
They don't merely need to ask the mother for that yearbook photo, they want the mother to cry as she hands it over. A photojournalist needs emotion on the far side of the lens, the more raw the better. To capture and thus exploit rawness is not an activity that necessarily encourages ethical behavior. Those Diana-chasing paparazzi in the tunnel alongside the Pont d'Alma have been getting a hammering for their brutish behavior. Photographs of the starving in Ethiopia regularly win prizes without people angrily protesting that the emaciated child would probably have preferred a glass of water and a biscuit than a Nikon or Leica shoved in its face.