Surprisingly the people blocking justice from happening is Isabel's parents. They are the ones that didn't, and never would believe Isabel. They are the ones that thought the tub was perfectly normal. Her parent't never physically blocked her from smashing the tub, but it was because of their actions to Isabel after hearing such ridiculous stories that made Isabel resort to smashing it instead of returning it for some other family to bye.
Although, because Isabel's parents wouldn't sell or return it, they did help the justice in the story to be fulfilled. It's because they wouldn't get rid of it that caused Isabel to have to smash the tub. If her parent's didn't block Justice in the first place than Justice would have never been served. Do you understand me? If the tub wasn't smashed than the curse would have gone onto another family, and then another, killing every family it comes in counter with.
Just because I've never seen or used and evil, killing bathtub doesn't mean I don't understand what Anthony Horowitz is trying to get across by using Jacob Marlin and is evil Victorian bathtub. Anthony was trying to tell us that we shouldn't let other people control our lives. I believe that by making Bella's parents ignore her, and that influence what she does, is showing us that we should control our own lives and try to go our own path. Don't let that path be influenced too much by others. Then you will live a happy life the way you want it to be.
