Yes, nicely described dynamics, which is in line with historical accounts and human nature.
That’s why we can assign high priority to scenarios of at least attempted command style economies post crash, mileage may vary, it would be immediately unsuccessful in some parts of the world, resulting in further cascading chaos and or small governable areas, while working for a while in other places. Obviously with the proviso there is no fulls scale global nuclear/.. war knee jerk reaction, and also at least some %% of regions will be able, willing to commit resources to cool nuclear waste pools for a couple of more years, before longer terms disposal etc.