A necessary evil, LOGO repeats. Balance is key. It changes from place to place, increases and decreases in complexity, and manifests in different ways in various value sets. Still, the fundamental concept remains in some ways constant. Nil does what she must.
"Purification" and "destruction" are a lot less chaotic than what one might imagine. In reality, "deletion" might be more appropriate. "Existence should not always be indefinite", claims LOGO.