I think issues are a lot less complex than you think. From anecdata, it simply looks like the burden of government, extended family, and increasing QOL costs,

I think issues are a lot less complex than you think. From anecdata, it simply looks like the burden of government, extended family, and increasing QOL costs, is much greater than ever on childbearing age men & women, for those living in developed countries. For example, men and women only started to take 10-30 year debt to buy a house, or to become a nurse...in the last 50 or so years. Thus, there are far fewer resources (including testosterone!) for child-rearing. Take for example what psychologists say about males being less fertile when they make less money than their partners, for example. Not having an opinion on whether this is good or bad. It just seems to be true.