About that picture... It's part of the nature of being a photographer in that situation. While it doesn't make sense to most people, it's the person taking the picture's job to take the picture and not really "make the world a better place" himself. Pictures like that one are the type that will send a message like, "something is going on here, it needs to be fixed." When it comes down to it, he did his part. Though, I admit I'd have helped the kid out myself in that situation I'm sure, that's why I keep to taking pics of stuff I know and don't go looking for stuff like this...lol.
You can kinda look at it like photographers in places like Iraq and Afghanistan right now... Or any other place in the world where people are fighting. Here's a vid that was made about a couple for some new series on TV:
http://www.hulu.com/watch/40037/in-h...-photographers
What you have to understand here, these people go in there unarmed to take pics of shit to show the rest of the world... and make money for themselves of course. The reason they can go into places like this and not get shot by whomever they are photographing, is because it's known that the photographer is there to do his job, not win the war by fighting or taking sides.
If a photographer picked up the little girl in the photo, it's almost the same thing as pulling out a gun and opening fire on the people you are photographing in a warzone. (metaphorically speaking of course, I'd rather not get lectured that it's very far from the same thing, I know that already.)
It's not your place to fight as much as it's your place to take pics and survive, let someone else do the job they're supposed to do, even if it's such a sad thing to do.