Orwell and Hemmingway would have needed passports to travel around Europe between the wars.
You are conflating documents and nationality. Your national identity is more to do with your environment: where and how you were brought up.
Well the Allied soldiers towards the end of the Second World War who dies, died attacking another country and the Germans who died did so defending their country and the Nazi regime. And yet we claim that the Allies were morally more justified than the Germans, even at that stage of the war, when they had clearly stopped posing us a threat.
As a point of correction, the so-called Rive Gauche (Left Bank) writers - Maddox Ford, Hemingway, Rhys, Bowen.,
et al - travelled about Europe freely. It was quite normal for the rich and adventurous to traipse the world without passport control or documents, albeit mostly pre-WWI but also, even in the '30's.
My comment about allegiance in war was a quip to highlight the fact the idea of 'Country', 'Emperor' and 'King/Queen' depends on history, when pre-borders, as we know them today, one fought on behalf of the King, not Country, and this chap would be whoever won the last battle for your tribe (which could be a bunch of second generation Danes who brought in Danelaw for your side of England). The ancient idea of the monarchy being hereditary was challenged in both Britain and Sweden (post-Danish rule) as a result of nobles rebelling against tyrannical kings (Charles, Erik) which is when parliamentary sovereignty over the monarch became established. So, indeed, there is a certain restraint on tyrants we have that the USSR, Japan and the Third Reich did not have.
What would be unusual about Stalin and his Holodomor is that it would be a Slav on Slav genocide, which is why it is often framed as an attack on the collective class of Kolkhoz rather than a genocide proper, as was the case of Hitler in his genocide of Jews, Slavs, Roma,
er al.
In respect of your comment about personal identity, I have friends with Portuguese last names and other than the ones who are Brazilian or Portuguese proper, or by marriage, whilst their families have been born in Britain and have been in Britain generation after generation, ask them how they identify and they will say 'Sephardic', despite their ancestors having been thrown out of Portugal more than four hundred years ago!