From a health and lifespan perspective, we've been breaking these rules since the advent of modern science and medicine. 'Natural' things like incredibly high infant mortality and the death of the mother during childbirth are now relatively rare in developed countries. 150 years ago, a family may have accepted that 2 of their 7 children wouldn't live to age 18, but that's because they were ignorant of what is possible. More of a Stockholm syndrome than a rational belief.