A line of reasoning that presents the opposite side of the author's argument is called (I believe) a counterargument. It states exactly the different thing from what you have first stated.
The fallacy being use here is when they say "we should all wear our school sweatshirts on to create sense of unity because they will help them feel like a of the school" the should already feel of the school because they are going to that school that's how I know this is a fallacy
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