In the news

Going back to the Marine A thing.
I served in Afghan, and before that in Iraq, and the amount of training we had before we went, about the laws of armed conflict and the rules of engagement, was huge. I can honestly say that nobody in my platoon was in any doubt of what amounted to acceptable behaviour and what would have constituted a crime.
As far as I can see it, he's guilty of murder, and should be punished accordingly.
Of course, there may be extenuating circumstances, and he may have been under an immense amount of pressure at the time. BUT, the fact that he then tried to cover up the deed and suppress the helmet cam footage speaks volumes. If he had put his hand up straight away and said "I fucked up, I'm sorry, but I couldn't take it and I need help...", it would, to me at least, be a stronger case.
Maybe the culture in the Marines is different, but the Army is really well set up for reporting and monitoring PTSD now, and there really isn't any stigma about asking for help. Every company, and ideally every platoon, has at least a handful of people trained in trauma counselling.
I struggle with the idea that there is any excuse, and it makes the thousands of us who went out there and managed not to execute wounded prisoners look bad.