How the hell could a photographer take this photo?
For whatever reason it was taken. Do photos like this teach us anything about humanity? Do they have some value in this regard?
Photos like this one (not this one of course) helped end the war in Viet Nam.
I'm not saying this was the motivation of the photographer in this case, but sometimes showing the atrocity, which is real, and people should know about it and not get a candy coated USG world view, sometimes seeing the atrocity is what it takes to make the voters take action.
Some of those images are burned into my memory to such a degree that I have no need to engage Google Images.
They certainly had an effect on peoples support of the war.
Journalism has been surprisingly less effective in this regard in the most recent decades. It seems that social media is partly filling in the gaps left behind by the vacancies in that kind of journalism.