Can anyone give me help with a stem cell debate?

stem cells can pretty much be the cure for everything in my eyes. take cancer patients for example...they have cancer becuz they dont have enough white blood cells to fight off the cancer...with stem cells those white blood cells can be cloned to replace the ones that have died.people who have been paralyzed can walk again. blind people can see for the first time in years or for the first time ever. people who are brain dead can be brouqht back to life.! Dead cells of almost any kind, no matter the type of injury or disease, can be replaced with new healthy cells thanks to the amazing flexibility of stem cells. thats the only reason why i support it. becuz it can change livez...