I mean ultimately, thats how wars are.
The existence of your people or not in an area should not be relevant. If it is relevant, that only leads to genocide and ethnic cleansing. Because noone would want to have a potential casus belli in their land, so they would eliminate all those that would enable something like that.
There are 2 kinds of countries in the world. Those who are satisfied with the current status quo and those who arent. The US, EU, etc are satisfied with the current status quo. Russia, China, Turkey, Venezuela, etc arent. They have issues and they think the current status quo is unfair. And they have irredentist views.
Why would you “freeze” the borders as they are now and not as they were 20 years ago, or 100 years ago or 500 years ago. What i am saying is that India is part of Greece, as per Indo-Greek kingdom of 2000 years ago.
Also the results would be different for different betray and split values. The video is biased because it wanted to have a feel good message at the end. In real life, things are very different.