Not "Jericho" - it'll be more like "The Walking Dead. The total breakdown of society will allow people to indulge their inner psychopath.
Examples include The Governor, Shane Walsh, the numerous gangs of marauders, and now the denizens of Terminus.
Other examples include the numerous riffraff who troll prepper threads and forums, declaring they will hunt you and steal your stuff. Selco and Ferfal write about real-world zeros who became wannabe Somali warlords in their own little turfs.
SHTF doesn't only mean the breakdown of the rule of law. It also means the failure of civility and the reassertion of the law of the jungle.
Too many of that type are in government right now - starting with Obama.
The only thing holding them in check is the 2nd amendment and the fact they need more time to purge the military of patriots and replace them with Obamabots.
I believe that in a true TEOTWAWKI situation the government itself will be the largest, most seriousand most immediate threat to preppers and other survivors with an independent spirit.