Well, Flyby, as long as you can't get that 'good guys - bad guys' thing out of your mind,
it will be impossible.
But even then, I think we may rather relate to the our homeland. Games with frontiers-
we still have that tribal thinking in our brains.
I mostly fly my native side, but really enjoy the French or Bristish side sometimes,
and had an American pilot from Dodge City, Kansas, flying a Nupe 28 - a real hotspur.
I imagine to be a bloke from a small village in Cornwall, or a young dude from Arras,
defending his fatherland - and it works. I can feel his emotions very well, as much as I
can feel the German pilots side.
It may help to read pilot's books from the "other side" - I recommend Udet.
You will see, there isn't much of a difference in their attitudes - it's only in our minds.