Unnecessary Subplot

I personally thought the subplot about the escaped serial killer and his girlfriend was completely unnecessary. It added nothing to the story, except for a few gunfights. Perhaps the writers thought this would add some excitement to the movie, but I thought the interaction between Mr. Brooks and his alter ego was fascinating enough to stand on its own. I wish they would've cut those scenes out, instead of the ones of Demi Moore sleeping with a younger guy and paying him for it. Those would've added more depth to her character. Also, there's a deleted scene that explained her questions about pottery. Why delete scenes that add to the story, instead of keeping ones that really detract from it?