A total collapse would not be pretty...especially in the larger cities. "Super-storm" Sandy was a perfect example; A majority of people did very little/nothing in preparation for the storm, and as soon as it was over, they all started wailing for someone to come & take care of them. Looting was rampant, and the area affected was actually much smaller than the Media made it appear.... many of the homes that were damaged were actually vacation/second homes (at least those on the Jersey Shore), so it wasn't as bad as some of the Hurricanes we get down here almost every year.
I've been through five MAJOR hurricanes since I've been here, and a hell of a lot of tropical storms, but we prepare for them, and take care of our own. Being without power for a few days a couple of times, and replacing my roof & pool screens is no fun at all, but we made it through without looting each others stuff.
If the economy collapses, and once the distribution system breaks down (won't take long - and they are TOTALLY dependent on it) the "metro" areas will turn ugly pretty quickly -they will be killing each other for food within a week...nobody knows how to live off the land anymore, and the Predator Class would be out in full force. Of course, those are also the areas that have disarmed the honest citizens - so it would be mayhem.
I have a 33000 gallon pool, a freshwater pond out back, loads of canned/dried foods and I live right next to one of the largest nature preserves in Florida with plenty of deer, possums, turtles, (and black bear, 'gators & snakes) etc.... and plenty of firearms & ammo. I could live very comfortably for years- no matter what. The biggest problem would be to keep the two-legged animals at bay - but everyone will have that problem.....just be prepared.