Morality and culture are what keep humans "civilized", its a cyclic thing, we get morality which allows for growth, but its restrained so we break some of the morality that we previously had.
With that break we reach a point of progress, a golden age, but as a culture and society we remain convinced that a lot of the progress was done by the changes in morality (and it was) so we keep breaking more and more, without realizing that it leads to decadence and the fall of said civilization, plenty of examples on this in history.
The ones that come after are weary and understand that the decadence brought by lack of any morality is what caused the downfall of their culture, and thus are overzealous in enforcing new morality, convinced that it will rebuild (it will, a bit but too restrained) and thus its cyclical.
We as a western society are around the golden age period, but probably starting to fall into decadence in some areas.
which, however, i honestly have no idea.