Since we're all starting to feel like Roman citizens watchign the Ceasars get weirder, more abusive and impotent, I thought I'd throw out a quick note on what can be expected.
When you're in high school, anarchy seems like an idea of a good time. No rules, no repurcussions, just fly out, bang down a liquor store, get loaded, and go apeshit. Well, like Alan Moore put it, that is only the "Land of Take What You Want.", not an ideal or beneficial system for any majority of humans. Any huge melee is NOT your invitaiton to become a drunken master urban combat god, it's a culling. Large ground engagements opperate via atrition. Attrition means your cracked head on the ground pitching a seizure while the brain fluid leaks out, for the gain of scratching a riot cop's face shield is PROGRESS.
Better armed and armored police or military WILL gas, stun, spray, hose, beat, curb stomp, and otherwise roll you. There's not going to be enough ambulances or police cars, so expect sloppy roadside exectutions. Ammo is a resource, so don't expect it to be pleasant. Even if you do beat down the local agents of "The Man" what then? Watch the ending of "Black Hawk Down", while imagining that the people stripping, beating, disfiguring and defiling the soldiers are all white college kids, office workers, or unemployment recipients and you're playign along.
Want to do some solo apeshit? Bad idea. Sticking with the mob might be safest, and very few folks know how to PROPERLY conduct running destructive mayhem. Everyone else will likely burn adrenaline for 2 blocks, then double over gasping for breath and blowing chunks. (drinking and running is a BAD idea.) Now you're a target, and you don't want to know who is huntign you, or for what.
The city will sleep soundly, one way or another. Quiet like New Year's Day will greet the next morning. No confetti, plastic trinkets, or food wrappers to pick up though. Just trash, smouldering wreckage broken bodies, and a few moaners hurt jsut bad enough to betaking the long way out. (incidentally, blow off enough adrenaline in one day and you'll have a hangover from the gods the next.)
A city stands on infrastructure. Without utilities and regular food deliver it becomes a desert of concrete and asphalt FAST. Guess what's about to get cut off to your urban warfare playground. How many days supply per person of food and water do you think are in one at any given time? To top it all off, some silly fucker drank all the beer. Fun's over. Now you're wishing you knew what the survivalist nuts knew, and trying to figure out what's left to eat. Meow?