From an individual's perspective, making money, obtaining honor and status, entertainment, and reproduction are the main goals of human life.
These goals are vast and chaotic, with everyone harboring their own ideas. In an isolated system, entropy naturally increases, making it difficult to form a lasting and consistent centripetal force.
"…Cosmic Governance is a great way to create cohesion! Because the universe is so vast, even a single Milky Way is enough to keep a Level 5 Civilization busy for hundreds of thousands or even millions of years… After playing with the Milky Way, there's the Large Magellanic Cloud, the Small Magellanic Cloud, the Andromeda Galaxy, almost an endless amount, so such a civilization would not degenerate!"
"But Cosmic Governance isn't the only way."
"If a civilization sharpens its ideology too much, it easily conflicts with other Level 5 Civilizations."
"What I mean is…"