At the present time it appears there may be a basis for charges. And to show we do back up our words, don't we wish others did the same, we will hold them accountable for their actions.
In this instance in certainly does seem that some very deranged individuals in the US Military committed a horrific crime. None of us have the evidence in the case other than what the media reports, but seems like this was more than just some accident happening in the fog of war.
What would be wrong is to assume that the US has any sort of policy for going out of the way to kill women and children. Civilians always get killed in war (which is why many rational people think it sucks). As much as I have always thought the Iraq war was a sham, this one incident does not yet rise to the level of a crime for anyone other than the individuals who directly participated.
Now, if you want to talk war crimes that do seem to go up the chain of command to the very top, then you should be focusing on Abu Ghraib, Guantanamo Bay, etc.
As an aside... discussing issues that are against official US policy or expressing opinions that question such policies is not anti-American. It is in fact the most patriotic and American thing you can do. Theoretically, that's why we fight all of these wars (I did say theoretically... it's obviously not why we really do it...). The US Gov't does some stupid things every once in a while and our system only works when we (and others) can criticize those actions and effect change.