One way I saw the author stray from the main idea was in the second paragraph where they stated how withholding words built up more suspense. For example, “... is he being executed? is execution the right way to deal with crimes, especially by people who display signs of mental illness? couldn't society develop a more compassionate way of dealing with people in the narrator's position?” All of these questions are very unneeded and unnecessary. They don’t do anything to support the idea the writer gave in the beginning. They especially strayed from the main topic when they mentioned the ‘execution mental illness’ bit. All this will do is confuse the reader.
To fix this issue, I’d completely cut out all these questions and find another way to restate them. For example, I’d use something along the lines of, “None of the questions flowing through the reader's mind are answered until much later in the story.” The way this sentence is now stated is very precise and stays with the main point.