And what likely happened after WW II was that there was insufficient change in the underlying culture. Likely insufficient account was taken of the ability of the females and older generations of males to transmit the negative cultural traits that were attenuated in their expression after WW II by the reduction of living males in the 20-40 year old age group. So when more normal population demographics reappeared so did the traits that had led to them being skewed in the first place.

"It is not necessary to have hope in order to persevere."