There may be other factors involved, as well. That's particularly the case because of the barbarous, completely uncivilized, and subhuman behavior of the jihadists who are the Islamic State's "fighters".
It appears we should treat this cancer while we wait, however, rather than waiting for that judgment. This would be in line with a statement attributed to a U.S. Marine (paraphrased): "It's God's job to judge the jihadists. It's up to us to arrange their meeting."