The commentary identifies iqnāʿ, persuasion, as rhetoric’s aim: securing acceptance of a judgment or encouraging conduct related to ethical and practical benefit.
A speaker may encourage people to keep promises, maintain public cleanliness or respect communal order. Listeners may not be prepared to follow extensive technical proofs, so the speaker uses premises and examples accessible to them.
Persuasion does not require deliberate falsehood. The classical category describes the kind of argument used; the ethical quality of its use still depends on truthfulness and sound judgment.