An overlooked factor in the decline of the West over the past two hundred years is urbanisation.
Urbanisation lowers inhibitions. You can get away with degenerate behaviour that you could never get away with in a small rural community. The anonymity of urban life makes it easy to abandon all the time-honoured rules of decorum. Adultery and other sexual misconduct will earn social disapproval in a small town or village. In a city no-one will care.
And no matter how esoteric your perversion might be you’ll find someone in a big city with whom to share it.
Now of course we have the internet, and social media, so urban degeneracy is available to everyone. The entire world is now effectively urbanised.
City life is remote from unpleasant realities. In a rural community it’s difficult to avoid manual work, and a good deal of rural work is dangerous. In the city it’s easy to avoid getting your hands dirty.
Cities turn men into soy boys. The lowering of inhibitions turns women into sluts.
The more urbanised a society is the more decadent it will become. It’s no coincidence that we’re approaching peak decadence at the same time that we’re approaching peak urbanisation.