There was a mod for COD years ago that tried to address this by presenting the perspective of the war from a member of the Wehrmacht. The character was supposed to be a soldier who joined in order to defend Germany who was apolitical...he joined the army because, from his perspective, it was supposed to be the right thing to do. It would basically work on focusing on his hopes to see his family again, whether he might die, or whatever else...not Nazi flag waving. It didn't get too far, though, and ended up with only a rough prototype of D-day.