Answer: Connotations can carry a meaning that the author did not intend.
Explanation: The definition of connotation is an idea or a feeling that is sparked by a certain word. The opposite of connotation is diction, which is best described as the "dictionary definition of a word."
Words can have multiple connotations that are different for different readers. One reader may read the word "tree" and think of the connotation "nature" while another may think of "tall," or "shelter." And that's a basic example for a very abstract word.
If an author uses a word that can carry heavy connotations with explicit positive or negative values, it might take away from what the author meant (e.g. using the word poison or gun.) It simply depends on the reader; since we can never predict who may be reading out texts, it should be as neutral as possible unless a specific emotional response is desired.