The seeds of the death of ISIS lie within its own methods and objectives, which are as abhorrent to many of its would-be subjects as they are to us. The group rode to its dramatic gains, in both Iraq and Syria, on larger waves of opposition to detested incumbent regimes. Its losses can be just as dramatic if the political circumstances that led to such opposition are changed. They already are changing in Baghdad, and it still is possible for political change of some sort, which excludes any groups as extreme as ISIS, to take place in Syria.
The extent of any terrorist threat to the United States does not depend on killing any one organization. It will depend partly on those political processes in countries such as Iraq and Syria. It also will depend on how well the United States, in going after any one monster, does not create other ones. In that regard we cannot remind ourselves often enough—especially because this fact seems to have been forgotten amid the current discussion of ISIS—that ISIS itself was born as a direct result of the United States going after a different monster in Iraq.