At times, the heavily politically laden agendas of some photographers can get in the way of the work by grating on one's own social and political sensibilities. When work is presented without such associations you get to take away what you wish about the human factors and place them into a context that makes sense to you. Surely our ability to empathise with fellow humans should transcend any political badge we might otherwise wear, and if it does not, then ought we not ask ourselves some hard questions?
As for conflict photography and change, surely the first part of this is understanding the context and consequences of our actions. This comes not just in the form of bodies crumpled into heaps, but in finding as much humanity as possible in the images which allow us to create some sort of a sense of what this all means in human terms that we can relate to. Opinions are what cause individuals to vote a particular way and to lobby and support particular groups and they are shaped by information.
Going back to the point above, by leaving out the personal politics, nobody is being told what to think here or what to do about it. While wars will continue, I am very confident that photography has played a significant role in preventing the human aspect being lost in the political throng. I would feel very uncomfortable if all conflict photograhers downed tools tomorrow and we were left blind. Importantly, I am terrified by the potential for some to exploit the darkness that would follow. While images may not have the immediate and universal war stopping effect some would want, I think they do have an influence (as John as already commented) and are there to constantly balance wayward minds and provide a communal reminder of the reality we are dealing with. Knowledge helps people make appropriate, informed decisions and it need be no more complecated than that. Perhaps conflict photography can be seen not only as active, but passive, valued for what it helps prevent and contain?
As for the truth, I am not a great believer in looking for absolute truth in photographs (although not quite as strongly as Winogrand), but we can perhaps find vignettes of the truth or small truths which allude to something greater. Sometimes the only truth we glean is the fleeting sense that we have somehow touched upon what something means to fellow human beings but without being entirely sure as to the details. To me, this has great value, because this is the backdrop against which all the politics takes place; its that fundamental.
While plenty of superb work is shot with the assistance of NGOs and other organisations, this is not always the case and were I to be cynical, this can be about access more than anything else. NGO links would not change the work, but for some might provide some sort of stamp of moral acceptance, which suggests a lack of confidence on the part of the observer. Its rather like being unable to purchase a painting you love without a buyers guide under your arm to tell you its 'really art.' While many are superb, some NGOs can also be hugely cynical using photography to elicit emotions to increase revenue to secure jobs and expand careers etc... even when the work has no tangible positive impact or could even be considered self-interested! All I am trying to suggest here is that trying to unravel the varied motivations on the part of photographers and NGOs etc can rarely be done in simple terms with scant knowledge. By defaulting to mutual human compassion, and by ignoring badges, things get a lot simpler and more universal.
Looks like the images were shot mostly in the 28-35mm range (or equiv) with a few normal/teles and a couple of 21s or similar thrown in.