ISIS was born out of the Salafist/Wahhabi ideology that the Saudi state has been exporting from the beginning of its existence. This is why terrorism is almost the exclusive domain of this one sect.
http://www.huffingtonpost.com/alastair-crooke/isis-wahhabism...
As another poster said, if every disenfranchised person in the world turned to terrorism, we'd have complete and utter chaos. But most don't.
As for you argument, Mali was in the grips of an Islamist army. They aren't any more. Thanks to French intervention.