The "We" adds to the development of the author’s message to show that everyone has a role to play.
Your question is incomplete as you didn't provide the author's message. An overview of the answer will be provided.
An author's message simply means the big idea that's in a text. It is what the author wants the readers to know. It is sometimes the lesson that the author wants others to know.
In this case, since the emphasis is on "we", it means that the author wants everyone to do that particular thing that's addressed in the story. For example, if the message is about love, the author can write that we should love each other.
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