You can't eradicate a group that has popular support due to sectarian divisions. The Sunni areas in Iraq and Syria have pushed out the government because it favored the Shia and gave them no voice. The only way to defeat ISIS is to remove their support from the Sunni tribes through political reconciliation. There was a good program on ISIS on CBC that basically surmised that the group took territory so quickly because they were welcomed by disenfranchised Sunnis that were treated like crap by Maliki's government in Iraq.
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