Once we realise that utilitarianism comes with the idea of blameworthy rightdoing (such as when you push a big man onto the tracks in order to save five lives) and blameless wrongdoing (such as when you don't push a big man onto the tracks in order to save five lives), then utilitarianism all of a sudden appears to give the right answers.
My readers have to work with me to create the experience. They have to bring their imaginations to the story. No one sees a book in the same way, no one sees the characters the same way. As a reader you imagine them in your own mind. So, together, as author and reader, we have both created the story.