Of all the Alinsky rules, the most relevant one is, "Make the enemy live up to its own book of rules." But he simply codified and made pragmatic the most destructive of the left's rules which is, "Make the enemy live up to his ideals." Even if those ideals are often the invention of the left.
Ideals are by definition impossible to live up to. Human societies aren't ideal, they're real. Ideals are absolutes and an unfliching attempt to live up to them destroys individuals and societies. More subtly, the failure to live up to them justifies hatred and self-hatred toward nations and peoples.