Why is vir bonus (Good man) such a concern to roman rhetoricians?

Vir bonus consists of mutiple points regarding rhetoric. Cicero and Quintilian emphasize how epidiectic rhetoric is present in all forms of rhetoric. Furthermore, epidiectic and deliberative deal with the same topics. The way the those topics are argued changes the type of rhetoric being used. They also emphasize how a rhetor is more successful when he or she appeals to the audience and considers public interest first. Essentially, the orator must follow society’s norms. Cicero believes that a good man must be able to learn and adapt, and unlike Plato, does not have arete from birth. Crassus points out how an educated man without virtue is a danger to society. Roman rhetoricians dealt with virtuous topic, either praising or blaming, they considered their audience, believed rhetoric was a skill to be learned, and most importantly, thought it was necessary to possess the vary traits they praised or blamed.