It is important to consider other positions because in most cases, your primary audience will be fence-sitters. Fence-sitters are people who have not decided which side of the argument to support.
People who are on your side of the argument will not need a lot of information to align with your position. People who are completely against your argument—perhaps for ethical or religious reasons—will probably never align with your position no matter how much information you provide. Therefore, the audience you should consider most important are those people who haven't decided which side of the argument they will support—the fence-sitters.
In many cases, these fence-sitters have not decided which side to align with because they see value in both positions. Therefore, to not consider opposing positions to your own in a fair manner may alienate fence-sitters when they see that you are not addressing their concerns or discussion opposing positions at all.
Organizing your rebuttal section
Following the TTEB method outlined in the Body Paragraph section, forecast all the information that will follow in the rebuttal section and then move point by point through the other positions addressing each one as you go. The outline below, adapted from Seyler's Understanding Argument, is an example of a rebuttal section from a thesis essay.
When you rebut or refute an opposing position, use the following three-part