John Keegan (via Instapundit) adds the necessary clarification about the state of the laws of war for why recording everything is dangerous for our troops:
The legal code, in short, is highly destructive of the emotions, comradeship, mutual concern and responsibility of seniors for juniors on which the military system operates. Traditionally, the British Army always recognised that the intrusion of civilian law into its way of life was undesirable. In consequence it maintained its own legal system in which, under court martial, soldiers were judged by other soldiers.
Never ever ever sign up for the International Criminal Court. We owe our troops this much respect. They fight clean but they aren't flexicuffing suspected enemies--which is what the evolving standards are demanding.