An argument should not stray beyond the specific meaning of its title; this impairs its ability to be re-used elsewhere because of its likely overlap with other arguments. Expounding beyond the meaning of the title ruins the re-usability of an argument.
For example, the subject of the argument shown below compares the prevalence of school shootings in the United States to other countries.
Because the argument doesn't have other reasons, it is allowed to have a description. And that description should not switch subjects to something unrelated like surrogacy, cancel culture, or looting. Instead, it should focus on providing more details about the number of shootings in various countries.