I don't agree with the overall framework of (anti-war) assumptions of the writer here, Andrew Anthony, but he makes some valid points:
I'd be a wealthy man if I had a quid for every time someone had told me that they didn't care whether or not Moore was a reliable documentary-maker just so long as he is against the war in Iraq.
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Recently I voiced the opinion that the tragedy of the war in Iraq, aside from the many innocent dead and injured, is that [it] has created the conditions in which reactionaries such as Moqtada al-Sadr and his followers can flourish. The woman I shared this thought with, a cultured liberal who cut her teeth in the anti-Vietnam war movement, looked at me in disbelief. "But they're freedom fighters," she said with something that sounded like pride.
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Freedom may mean different things to different people but there are limits to how much you can stretch the word and those limits stop worryingly short of the Iraq that Sadr would like to see.
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My own proviso on the question of an enemy's enemy being a friend is that it only makes moral sense if the enemy's enemy is not worse than the original enemy.