First, I think any war crimes trial in war is a joke. I have a feeling the army will make this soldier a scapegoat to appease the already increasing Arab backlash against the Fallujah assault and this incident. But, you can't apply such standards to a combat zone. Soldiers are trained to kill. Period. That is their job description and it is about time the US accepted that instead of wanting to believe somehow war can be made sanitary and safe.
However, it is very important the press report all sides of the war, and that includes the incredibly unpleasant realities that sometimes wounded people get shot for no other reason then they are there. Why? Because events such as this happen, and the American Public needs to be aware of all sides, not just those that make us look good.
This is the holdover attitude from the Clinton administration ala Vietnam. Thankfully, George W. has removed the last resistor in his cabinet and replaced him with a loyalist. Perhaps now both the State Department and Defense Department can be cleansed of those who think like you.