Yes, stories can be just as powerful by providing a different perspective on a scenario and showing what can happen if certain events take place or if we allow certain issues to persist. For example, in the novel "The Man in the High Castle", the novel depicts a world where the Nazi Army was allowed to take over the world. Even though it is a fictional scenario, it still shows what the world can turn into if we allow hate to grow and spread. This can be very powerful and allow individuals to understand the dangers of not fighting for a good cause or issue.
While a subtitle can inform the reader of the topic of the text or give more information about the title, its main purpose is to be an extension of the title.