You must think they have some power over the dead. I don't
They indulge in foolish ceremonies. So what. How does that hurt me? How does that hurt you?
Being a thing is a choice of volition and Mormons are appending others lives without any regard for anyone's feelings regarding their religion, beliefs and practices.
These baptism rites diminish the need for Jesus dying for mankind's sins. It's not all about YOU. People like Mitt and Glenn Bek believe that that they are Christians when Mormonism is a cult. Again we Christians care because these beliefs will keep people from the truth.