Discussions about the duty of a photographer is complex. It changes by the place,time or the subject of the photo.
I also can not decide what are the responsibilities of a photographer. It gets philosophical. This is more complicated when it comes to the news-photographers. Because they are mostly facing with wars, riots, savages or so on. These risky position makes them to decide between observation or participitation.
When I thougth about this discussion, I remembered the little african kid and vultur; and how the photographar commited suicied a year after he took the photo and also got a pulitzer award by it. For more detail..
I'm sorry to add sorrowful pictures today, but these are the facts we also have to discuss about in my point of view...