Yeah, the smiling seems more like desensitization. He doesn’t seem to promote, excuse or justify the crimes. He knows they were horrific.

War is hell. None are moral. The difference is that some are completely unjustifiable (e.g. aggression or imperialism vs self-defence). Human rights abuses, rape, murder, torture, and psychopathy are present in every single warzone in history, and committed by both sides; though the volume of crimes can be extremely lopsided.