I think its more of a cop out at the uncle sam american soldier. It implies, soldiers may think they are helping other less fortunate people in this world, and more significantly, doing a good deed, but really the things they do don't help the world, just doing further damage. And its not the soldiers suffering from the 'negativity' of war, but its the people who they affect by being, a "hero of war". So inevitably, there is no such thing, as a "hero of war".