You seem to be under the misapprehension that morality is dependent on specific knowledge
No, just questioning your knowledge of doctrinal practice and military service that makes you think that serving members of the armed forces which "decide to be the hammer" are at fault according to a war crimes tribunal. Your statement was blindly thrown into the debate with no justification, no back-up and no explanation. I just don't see what that comment added to the debate at all.
You are quite right though that "just obeying orders" is no excuse. Todays servicemen are (in the main) aware of this and act responsibly and appropriately in response to fair and legal orders only. It is the people at the strategic and grand-strategic levels who write policy and who define what is right (or not) that are of interest to war crimes tribunals.