The concept presented at left is important, but one whose only answer is that this civilization is far more likely to go extinct than it is to survive via the cessation of war. I base this on the way our species came to be and evolved to where it is now, over the last 100K – 200K years, based as it is on tribalism and the endless wars between these tribes, combined with slavery and other forms of unimaginable cruelty.
Is there a chance that humankind will encounter some event that will pull us together in some unprecedented way that will overturn these trends? Sure, it’s conceivable.
The most optimistic of our science fiction writers have been working at this for generations. Maybe one of them will ultimately be right.