Based on very personal experience, I am dead certain that the decrease in nuclear family demographics represents a foreshadowing of societal decadence.
We evolved in the developmental context of the mother/father/child triad.
Remove a parent. physically or emotionally, and the early life programming is thrown off course, resulting in some form of mental illness.
Link: https://www.americanthinker.com/blog/2021/12/the_census_bureau_released_appalling_information_about_the_american_family.html