The Shadows don't really follow their own philosophy.
For a species who believe in the necessity and desirability of conflict and chaos in driving the evolutionary process forward, they never seem to fight with each other. Anytime we see them, they act as one. If not a hivemind, they are still very closely in sync with each other. Why don't they pursue conflict to improve their own race? Or is that all nonsense, and they simply get a nihilistic pleasure out of making other species destroy each other?