According to Wikipedia, "Photojournalism is a particular form of journalism (the collecting, editing, and presenting of news material for publication or broadcast) that employs images in order to tell a news story."
Ideally, the photojournalist should be taking honest and impartial photos to tell his story. Yet every time a shutter is tripped, a decision has been made to create an image representing……what?.....usually representing the bias and agenda of the photojournalist. The photojournalist subjectively and selectively chooses his images. He decides this moment is significant, that moment is not. Human beings act with purpose. Hopefully, the Photojournalist’s purpose will be to inform the public honestly and not to drive home his point of view. Leave that to the editorialists.
Staging and editing aren’t necessarily falsifying…but they can be. Also, some photos may be interpreted in more ways than one. That’s why captions and accompanying word articles are all but mandatory for photojournalistic essays or even for individual photos. That’s where the honesty and ethics of photojournalism are brought-to–the-fore and clarified (or should be).