“After 4 days without power - most large American cities would be in the MadMax Zone...”
I think most Americans can stick it out 10 days to 14 days IF THEY KNOW THE POWER IS COMING BACK ON A PREDICTABLE DATE.
If the people don’t know when it is coming back on, then most everywhere will go Mad Max within hours or even minutes.
After a hurricane the looters are out before the wind dies down.