This is nothing new in East Asia and the society there is not infractuated with if their young men are getting laid or not. The west is just finally catching up.
I think the reasons depopulation is generally depicted as a bad thing are: (1) if it happens too quickly then your society doesn't have enough young people working to support the old, (2) capitalism--the most effective economic engine we know of--works best with a growing population, and (3) states derive geopolitical advantage from having large populations.
Produce a child who will either suffer in his own ignorance or will suffer while aware of the ignorance that produced him. Great.