If the writer’s opinion is not objective, it mostly means
that the source is biased. Objectivity is very important aspect of any writing.
If the readers perceive that the writer is being biased, they probably will
undergo selective perception and chose one thing from the piece and omit the
other. It is very important that the writer writes in a way that the reader
goes through the entire piece and retains as much about the piece as possible. It
can only be done by writing objectively.
Assuming that you're referring to the poem of the city of the yes and the city of the no,
The poem uses an antithesis of Yes and No to represent openness and complete solitude
hope this helps