To talk about something off-topic, in a society with low marriage rates and social moral standards, both marriage and birth rates are low, leading to long-term population decline... This implies that the sustainable economic capability and the ability to respond to future sustainable wars are also continuously weakening...

A highly capitalized country essentially lacks cohesion and long-term combat effectiveness. Ukraine is a typical example, and Japan is also a society with low marriage moral standards, making its mobilization capability for future wars and the sustainability of its wartime economy quite fragile.