Reading the story, I felt the government was forcing to people to hate Germans. The black American soliders had no reason to hate Germans. War destories everything. People, nature, art, etc.
I woder if Arturo wasn't white, whether Train treated him differently. I think Train would treat him differntly because he might be thinking white privilege (white poeple are better than color people. etc)unconstiously even though he didn't like white people.