ISIS seems mostly to be western "idealist" muslims, recruited by extermist imams where those can operate (ie. in the west, mostly Europe, in Saudi Arabia, and not very many other places). The locals found them, well, what everyone finds them : cruel, extremist morons.

(Imams are tightly controlled in places like Iran, Turkey or Egypt. Why ? Well let's put it this way : "mosque" does not mean house of prayer. It means fortress (house of prayer is masjid. Keep in mind that that arabic is weird. Masjid by itself means house of prayer, but combined with other words it means different things, sort of like latin). The states there, well, it's not like there's anyone in them that doesn't know this. So recruitment of locals there cannot easily happen, except by the "state" (which may be a lot more local state than a map would have you believe))

The problem is what western agencies are pointing out, but nobody's listening. Currently Syria and Iraq are the targets. Mostly because they're in the middle east, and allow "other" religions (Shi'a islam is "other" to these guys, as is Druze religion, Alwite, hell, they're not all that fond of wahhabism (too many compromises for the state and the oil, first and foremost of course, the alliance with the United States, and "with Israel") ...). That won't last. We, as in you and me, England and Sri Lanka, Japan and Alaska, are on their list. They're just having some trouble with numbers one and two (Saudi Arabia and Israel).