By Catholic Cultrue, (Catholic World News) - Pope Francis announced today that he plans to change the Catechism of the Catholic Church to say that the possession of nuclear weapons— even for purposes of deterrence— is immoral… “The use of nuclear weapons is immoral, which is why it must be added to the Catechism of the Catholic Church, the Pontiff told reporters during an in-flight interview as he returned from a visit to Thailand and Japan. “Not only their use, but also possessing them.”.. The Pope’s remark matched a statement that he had made in Hiroshima, saying that the possession of nuclear weapons was immoral.