you’ve explained why borders exist at all, but their current configuration is still arbitrary and mutable and that’s part of the point. we’re watching right now in Ukraine proof that, with sufficient blood and treasure, anyone is capable of looking at the current configuration of borders and saying “nope!”. We watched it happen in 2016 too, when Russia bit off Donetsk and most of the world acted like the new borders were actually the correct borders for all of history and that the theft by violence of huge chunks of land was us just helping transition to the natural state of things. When this war ends and the dust settles between Ukraine and Russia we will treat those borders as though they are ordained by god, too, even though we just watched them change.