Not only that but people get bored with "old news". Even if supporters don't turn against you, they quit being enthusiastically for you. The lesson learned is that if we're attacked again like on 9/11, we ought to kill however many of the enemy as it takes to make them surrender, and do it quickly enough to be done with in a few months.
No feeding the poor and no "win over hearts and minds" like Bush. No notifying ahead of time where the attacks will be like Israel does. Evidently the leftist propaganda will still be against you and eventually convince the masses that you're the bad guy. So finish the job quickly and hard enough to teach the enemy to never ever ever attack you again.
That works.