Choose articles with strong, clear arguments. Even if you do not agree with the points made in the articles, make sure they are easily understood and analyzed. Choose a topic you know. For instance, do not choose a topic in microbiology -- where you would spend months learning the background details to form a legitimate analysis -- if your field is economics. The article you analyze must be well-supported and fully detailed, so you have a strong article to analyze, but you should not have to look up definitions or meanings of every sentence. Do not choose neutral articles to analyze, such as scholarly documents written without bias. You want bias. You can then use scholarly articles to support or refute the analyzed article, however.
Because rhetoric is a public art capable of shaping opinion, some of the ancients including Plato found fault in it. They claimed that while it could be used to improve civic life, it could be used equally easily to deceive or manipulate with negative effects on the city. The masses were incapable of analyzing or deciding anything on their own and would therefore be swayed by the most persuasive speeches. Thus, civic life could be controlled by the one who could deliver the best speech. Plato explores the problematic moral status of rhetoric twice: in Gorgias , a dialogue named for the famed Sophist, and in The Phaedrus , a dialogue best known for its commentary on love. This concern is still maintained to nowadays.
Here the argument rests not on the metaphysical possibility of abolishing public schools (no one is debating the nature of reality) but on its ultimate likelihood . Even if your opponent admits that the likelihood is not zero but very close, you cannot accept victory. People are often motivated by what appears achievable, and the greater the possibility the greater the motivation. Something with a % likelihood is not very motivating. (Keep in mind that your goal as a rhetor is to convince an audience.) It’s metaphysically possible for everyone on the planet to jump simultaneously, but the likelihood that it will ever happen is basically zero. Therefore, there’s little incentive to try. (Let the Kickstarter campaign begin…)