I'm interested in pursuing this. I'm not attacking you, and I don't expect you to have all the answers. Sorry if I came off that way..
No problem. I wasn't offended or angry if I came across that way.
Let's play with it.
Scenario 1: The majority of a fictional province. . . oh, let's call it Kay-beck, purely fictional of course, wants independence from their country, let's call it Kanata. History/tradition has it as part of Kanata since Kanata's founding. What prevails, the will of the people or the history/tradition?
Variation a: Kay-Beck wants not only to secede, but to join a neighbouring country, let's call it the ASU (again, purely fictional). Are Kanata's sovereignty/national security issues a factor to be considered?
Sure its national security issues are to be considered. So the ASU should reassure Kanata it has no intention of attacking it, and one way of doing that is showing respect for international law. Now, let's just suppose all of these fictional countries like to present themselves as Christian countries, and all of them abide by international law, then certainly they could find common ground in the love of Christ, no? In which case they'd all share the same 'national security interests'.
Variation b: What if Kay-Beck wants to join with a geographically remote country that has a similar culture and language, and that country (let's call it the purely fictional Terre-de-Francks), in a fit of temporary insanity, agrees?
Same.
Scenario 2: The U.S. Civil War. Was Lincoln wrong to hold the South by force??
Was it legal? If it was legal and for a just cause, then yes. I'm not a pacifist; I just limit myself to just war.
Scenario 3: Another purely fictional people, let's call them the Curds for their love of cottage cheese, are split among four or five bordering countries. They want to separate the majority-Curdish portions of each of these countries and form a new state, Curdistan.
If it's in accordance wth international law, then why not. Let's suppose, for the sake of argument, that they're all a Muslim people, certainly they coudl find some common ground, no? And even if different religions, if they all teach justice, love, brotherhood, then what's the obstacle?
I could be wrong, but this is just my current quick flow of ideas.