A journalist captures what is in front of them, they continue to work. if they turn away, they stop being journalists and become gawkers.
Can you imagine if no one photographed the horrors of WWII? We would not believe it today.
You think so? I disagree. We don't have photos for the overwhelming majority of human history, but that doesn't make us doubt it, does it? In fact, it's a kinda strange point to make in a discussion about this very subject, as indeed the men who piloted those aeroplanes believed rather fervently in an invisible guy in the sky, for which there exists zero editorial (or otherwise) evidence.
I'm also not really understanding the repeated use of the term political correctness in this thread; debating the use of violent imagery in the media isn't a matter of political correctness (which is about perceived discrimination and the avoidance of language enabling it), but a simple one of taste. I know that if that falling man were a member of my own family, I'd be disgusted and traumatised by its use in the media. Someone earlier made a comment about the glorification of violence in the media, and I personally see the falling man as yet another example of this.