Proper rhetoric is useful to prove points that are rational or irrational. if i write liek dis no matter how smart my point is u wont care no matters how rational u think u r the presentation of facts and stuff will matter. u dont listen to people who cant show da fact to u rite, u ignore em.

Rhetoric is not about getting people to believe stupid things; it's about knowing how to persuade people to believe what you want them to believe. If what you believe is well-supported by evidence, your rhetorical approach will probably be quite rational. If what you want them to believe is contradicted by evidence, your rhetorical approach will probably need to be anti-rational or else simply dishonest. Persuading people can either advance rationality or inhibit it.

As an obvious example, you can persuade people to think rationally, and you can persuade people that they should eschew rational thinking. Rhetorical skills are the tool you use, not the outcome.