It was always thought that certain corpses were offered a special dispensation by which divine intervention would prevent them decomposing as a sign of their evident holiness.
Saints and knights. Kings and clerics. Holy corpses used to inspire nations.
It was simpler then. Hierarchies were still in existence. Religion was a binary affair.
With all boundaries broken now, society had nothing to left to regulate itself with.
And in any case there were simply far too many corpses for any such distinctions to be relevant any more.
Any intervention now was far from divine. There was no purpose to such a distinction.
And so the survivors did what people have always done. They hid among the rubble. The constant reminders of collapse. The deluge of debris.