I love British newspapers. "Please, Mom, I don't want to die." Now that is a lead. Oh what could those crazy Palinites be thinking? National Health care leading to death panels? Absurd!
Once you make a decision to subject the entire range of medical decisions to cost benefit analysis you are going to make decisions about who's life is worth more. It is impossible to make decisions about what diseases are more important than others without making decisions about whose life is more important. And if you are the government you have to make those decisions in the form of general rules. And if you start making general rules you will find cases where the general rules end up leading you into some bad individual outcomes.