A writer must be aware of connotation As opposed to denotation, which has no literary use And its use in propaganda and other unpleasant things In order to make the reader have an emotional reaction Because connotation so frequently bores or annoys readers

I believe the answer is: in order to make the reader have an emotional reaction

In a writing, a connotation is words that is used by the writer to evoke a certain idea or feeling from the reader. This connotation is often used to make the reader have an emotional reaction by creating a connection between the event in the writing with the event that is relatable in most people's life.

A writer must be aware of connotation to produce various emotional effects in the reader, but it cannot be said that denotation has no literary use since realism as an era was mostly about denotation which would lead to some further understanding.