Our people are there in harm's way. No point in agrguing about how that happened at this point. Also true is the fact that we cannot cut and run.
One of our philosophical fallacies that we seem to be stuck on is that we are better than them. Not so, just different. If we give equal weight on the nobility scale, or the humanity scale or the religious scale, or in whatever manner you choose to measure, a value, we come up the same. Our traditions say otherwise, but some traditions are built on smoke. Just ask the tribes about our 'good guy status.'
It appears that some Marines did murder some civilians. They should be punished. The officers that let it happen or that could have stopped it should also be punished. Commissioned or non-comissioned. No favor.
Trouble is, it is really about us and them at that level, and sometimes it is better to kill than be killed. It is hard to fathom that some or our guys would do something like that. But it appears to have happened and it is probably no the first time. Hopefully it will be the last but I have little faith in the matter.

An aside; how many of you have broken up a dog fight and gotten bit in the process? A dog that would never bite you in a one on one basis will sometimes get a piece of you in the heat of the fracas. I deal with Siberian Huskies often and I have been bit in the heat of battle. Goes with the territory and it is more a matter of a piece of me being in the right place at the wrong time.
No parallel here. Just curious.