When you speak about a public controversy, you have an obligation to do more than simply express your opinion. As a citizen, you have an obligation to back up your opinions with arguments and evidence. Prayer in the schools, the future of social security, the patriot act, illegal immigration, affirmative action, medical malpractice, gay marriage; all of these issues spark controversy because people have strong yet conflicting opinions. They are public controversies because they affect large numbers of people – and because they require that we make decisions about new laws, how to spend tax dollars, or what programs and policies we adopt.
Ethical proof: refers to the audience’s perception of the credibility of the speaker and his or her sources. The constituents of strong ethos are trustworthiness, competence, open-mindedness, and dynamism.
For persuasion to take place, you need to engage your listeners’ emotions. You can engage your audience’s emotions by using strong, affective language, appealing to shared social values, providing specific, vivid details, helping listeners to visualize what you are talking about, or comparing the unfamiliar to the familiar. Emotional appeals, however, can be deceptive and manipulative and should never replace reasoned arguments (think back the demagogue videos).