I myself first went to Afghanistan as a young Army officer in 2002 and returned two years later after having led a small special operations unit — what Mr. Assange calls an “assassination squad.” (I also worked briefly as a civilian adviser to General McChrystal last year.) I can confirm that the situation in Afghanistan is complex, and defies any attempt to graft it onto easy-to-discern lessons or policy conclusions. Yet the release of the documents has led to a stampede of commentators and politicians doing exactly that. It’s all too easy for them to find field reports to reaffirm their preconceived opinions about the war…

Mr. Assange says he is a journalist, but he is not. He is an activist, and to what end it is not clear. This week — as when he released a video in April showing American helicopter gunships killing Iraqi civilians in 2007 — he has been throwing around the term “war crimes,” but offers no context for the events he is judging. It seems that the death of any civilian in war, an unavoidable occurrence, is a “crime.”

If his desire is to promote peace, Mr. Assange and his brand of activism are not as helpful as he imagines. By muddying the waters between journalism and activism, and by throwing his organization into the debate on Afghanistan with little apparent regard for the hard moral choices and dearth of good policy options facing decision-makers, he is being as reckless and destructive as the contemptible soldier or soldiers who leaked the documents in the first place.