it's relatively rare today. i hope that we all admit that. the vast majority of conflicts are civil wars of one nature or another.
This is not new. I recall a discussion with a college prof shortly after our withdrawal from Vietnam.
I asked him how long he thought peace would last until there is another war. He said "Peace? At any given time there are a dozen wars going on in the world. You just don't hear about them."
He then listed 10 current wars (7 of which I had heard of).
Most were rebels trying to overthrow the state govt. Some were sectarian. Some were historical (these two factions have been fighting for a century.)
I think we're more aware of these wars because prior to 9-11 America was involved in state to state wars.
I became convinced that war is the natural state of humanity. I recall a line from "I'm Down" the autobiography of a girl raised in the hood who transferred to a rich school and promptly punched a boy in the nose because of something he said.
Principal: "Young lady, you must understand that violence doesn't solve anything."
Girl: "Ma'am, where I come from violence solves everything."