WikiLeaks has proved its worth once again with the huge leak of more than 90,000 pieces of classified material on the war in Afghanistan between 2004 and 2009. The whistleblowing site made the files available in advance to three publications -- the Guardian, the New York Times and Der Spiegel -- a perfect example of the sort of collaboration that can take place between "old" and "new" media.

The Guardian reports that the documents show how "coalition forces have killed hundreds of civilians in unreported incidents, Taliban attacks have soared and Nato commanders fear neighbouring Pakistan and Iran are fuelling the insurgency".

It is no secret that the Afghan war is unwinnable, nor that it has claimed the lives of thousands of civilians, but what the documents prove is that the situation is even worse than previously thought.

Here are some of the grimmest reports of what is still called, appallingly and euphemistically, "collateral damage":

French troops strafed a bus full of children in 2008, wounding eight. A US patrol similarly machine-gunned a bus, wounding or killing 15 of its passengers, and in 2007 Polish troops mortared a village, killing a wedding party including a pregnant woman, in an apparent revenge attack.

The White House has chosen to come out fighting, condemning the leak and pointing out that the documents only go through December 2009, the month Barack Obama's "surge" began.

Here's the official statement: "We strongly condemn the disclosure of classified information by individuals and organisations, which puts the lives of the US and partner service members at risk and threatens our national security. WikiLeaks made no effort to contact the US government about these documents, which may contain information that endangers the lives of Americans, our partners, and local populations who co-operate with us."

The claim that the material could endanger American lives is disingenuous. As the Guardian report points out, much of the material, though previously classified as "secret", is no longer militarily sensitive. WikiLeaks has consciously excluded any material that could endanger troops or give away official secrets.

It was left to John Kerry, head of the Senate foreign relations committee, to provide a more constructive response. He said:

[H]owever illegally these documents came to light, they raise serious questions about the reality of America's policy toward Pakistan and Afghanistan. Those policies are at a critical stage and these documents may very well underscore the stakes and make the calibrations needed to get the policy right more urgent.

But Kerry is wrong to assume that the policy can be improved through selective "calibrations". So long as US policymaking continues to be based on the false premise that the war is "winnable," no relief is possible. The latest leak, one of the biggest in US military history, only reinforces this conclusion.