I hate propaganda films, they're an insult to my intelligence. Propaganda films are coming from one of the parties involved which pretends to be speaking 'objectively'. Like I can't see you're on one side of the trench. I may choose to fight with you, or pay you taxes, but I should know I'm not allying The Angel of Righteousness, but one of the sides trying to **** up the other side.
The thing about ethnic purity or nationalism is that it eliminates the guilt of choosing which one of your 'brothers' goes down. They're all your brothers, and you're told you're supposed to love them equally. Yet as I was saying, we are competing, all living things are. Somebody HAS to go down. That's when we create guidelines and principles that are not respected much, mostly because it takes years of studying to understand them, and it takes everybody's cooperation to uphold them. (these laws choose who goes down and who wins, and eventually crumble) So the merit of nationalism and borders is blissful ignorance and a much more intuitive and irrational way of settling who goes down: the other guy, the different one.
I'm pretty much like everyone that has commented, and I've said it in the initial post. But you see, even if you understand people, even if there are no barriers, there will still be winners and losers. There will still be the higher-ups and the rest. We cannot create equality, because equality is something for machines, not for living creatures.
My view on this is of someone who would like to believe in a common dream, but sees the impossibility of it. We can continue on this argument (although it's a dead-end for my idea, it's almost 0 support), but I'll give you another: