9/11 is incomparable. The amount of resources and interest Israel has to monitor the movements of Palestinians in Gaza and elsewhere, particularly the Hamas, cannot possibly compare with US trying to keep tabs on half a continent across the globe.
And finding a simple person that could be anywhere is also an incomparable situation.
What? The memo literally said Al qaeda was determined to strike the us with hijacked airplanes. Almost exactly one month before it happened. Are you not old enough to remember? Here’s the memo: https://en.wikipedia.org/wiki/Bin_Ladin_Determined_To_Strike...
And finding a simple person that could be anywhere is also an incomparable situation.