That's legal analyst Jack Balkin's summary of where we stand.
Writing in favor of developing international mechanisms to keep the peace makes one a target of mockery. How naive!
But let's get serious here: what stands between the people of the planet and the war of all against all? Only such mechanisms of collective security as, haltingly, the people of the world have affirmed through their governments, most notably the United Nations Charter. When particular governments turn aggressive, or are led by monsters (even if with the approval of majorities of their own people), only the collective work and will of many neighbors can curb them.
When you live in the stomach of the worlds actual rogue empire, the United States, it is hard to imagine that "collective security" could be a real force. How could the Lilliputians tie down the giant Gulliver? Probably, right now, they can't. But as the giant bankrupts and exhausts itself, someday they must and they will.