I agree partly with Juan Cole on this:
The US was very good in the Cold War at containing Stalinism but very bad at defeating a guerrilla group like the Vietcong. It was the former that mattered in the end.
Unfortunately, the logic in Washington usually ratchets toward the macho and the simplistic. Obama at first admitted that the US could only degrade ISIL, not destroy it. But then on Wednesday the chorus of critics pushed him to say that his goal is eradication of the organization. But the tools he announced for his effort, including Yemen-style drone and fighter-jet attacks, were not sufficient to the task of eradication. Containment is doable. It isn’t clear that an air war is.
Obama wasn't pushed, he jumped!