Stop for a moment, slow down. You missed the point. I gave you an example of a society from the ancient world. Every society in the ancient world had regional warfare, but not everyone declined and disappeared as did Sparta. We know that in part the insular behavior of the Spartans led to its own demise, via resistance to change and a notoriously exclusive warrior class. There are some parallels to some of today's societies, not an exact match. If you're not interested exploring the parallels, fine, move on. And please don't say you're 'sorry' when you mean something else entirely.