Okay, first off all this happened in foreign land. So laws of the US really don't apply over there. He would have to normally face the laws of the land he broke where he was caught. But since he was in the military and over there for deployment then we subject him and others with him to the UCMJ (Universal Code of Military Justice).
Usually the UCMJ is quite severe as commanders typically want to make examples of idiots for the littlest thing. That is usually the case. Trials by the UCMJ are not like trials in a normal criminal court case. Nor can he be tried in a normal criminal court case here in the states.
Still, the fact is we don't know all the reasonings behind this case. Was him and his squad told that the entire town was hostile and to proceed with extreme prejudice? In which case his actions were based solely off the information and directions provided to him by superiors. Which doesn't negate the fact that he DID those things, but that he was still following orders to a point. In a war it is harder to judge good lawful orders from bad ones that shouldn't be followed. Strange as it seems, the movie "A Few Good Men" had quite a decent plot involving a scenario of marines just following orders that should be questioned instead. But it's really hard to question orders from a higher officer. Why? In peacetime if you question orders that turn out to be lawful then you can be subject to a court martial and drummed out at best. In war time? You can be executed for treason.
From my experience if he has his sentenced cut then it was probably because he was following orders at the time. Bad order, but doing what he was told.
If this had been orders from above, then the story got it wrong - saying it was him who gave the bad orders and admitted it, not a word about coming from above; and I doubt it would have gotten this far as a prosecution if that were the case; and finally there would be a serious lack of justice for his superiors if that happened.
I think you are not only making things up but doing so in contradiction to what evidence we do have from the reporting.
I see a pattern - look at that helicopter killing Wikileaks exposed - reportedly no one was convicted of anything for that. There seems to be a pattern of lenience.
It's a shame for our country to have this happen and to light punishment accepted.
I'm sympathetic to 'it's war' up to a point, but there's a point where we need to prevent these wrongs.
Fact is, IMO, our media is part of the problem - we see no reporting sympathetic to the victims and families and friends to better appreciate the harm. They're invisible.
All the sympathy is aimed towards the troops, so the public is more accepting of excuses for wrongs.