The always relevant Strugatsky brothers. Written in the 70s, applicable today

In times of global catastrophe, civilizations unleash upon the surface all the filth, all the filth that has accumulated over centuries in the genes of society. The forms of this scum are extremely varied, and they can be used to judge how dysfunctional a given civilization was at the time of the cataclysm, but very little can be said about the nature of this cataclysm, because the most diverse…