A good critique can also double as a playbook. Consider Augustine's "The City of God". One of its more famous passages[0] can set a man on a virtuous path, or serve as the basis for political control in the form of, say, sexual liberation.

[0] "The good man, though a slave, is free; the wicked, though he reigns, is a slave, and not the slave of a single man, but, what is worse, the slave of as many masters as he has vices. "