Nuclear armageddon is not the same as more common natural disasters. You’re talking about the end of order globally basically as we have known it for thousands of years.
Besides, I was commenting more specifically on the idea of going to back to a “Stone Age”, not just looting or rioting. Hunter-gatherers do not generally practice Catholic sexual ethics, or Catholic ethics in regards to life. When Daniel Everett was living with the Piraha they killed a baby that was suffering from a curable disease by feeding it rum because they believed it was doomed to die and that he was continuing its suffering by trying to save its life. Most hunter-gatherers are pretty loose sexually too, at least from our perspective.
Seems counter intuitive but comfort and plenty is harder on people than austerity and hardship.
I think it is hard to argue this as a general historic rule, even looking at the “developing world” today. When life ends easily it also becomes cheap.