Life is precious because it is beautiful and reflects the divine. Our lives have inherent value because they are an opportunity to create and uphold beauty, thus reflecting the transcendent and divine. Your life isn't valuable just because you exist, you are born into a world morally obligated to do your part to contribute to the grand scheme. A society which abandons the divine as its foundation becomes merely self-referential and devolves into hedonistic auto-fellatio, and in doing so it must wither and die, to be pruned away by God to make room for new, healthy branches which can once again bear fruit.