ISIS didn't arise spontaneously after an earthquake. It was intentionally built over a period of 10 years by a coalition of political parties and religious movements as a continuation of the insurgent war against occupiers, with the eventual goal of establishing a new society with new laws: their mission was inherently social and cooperative (by means of military conquest).

That's hardly the prepper expectation of "there will be a solar flare and then the whole world will instantly be filled by roving gangs of psychopaths, like in The Walking Dead"