It will never stop being funny to me that 9/11 worked pretty much exactly as OBL wanted it to.
It drove us completely insane, caused us to massively overestimate ourselves, overreact, overextend, and fully mask off ourselves. 25 years later, we have now totally destroyed ourselves.
It worked, he won, he got what he wanted.
History has valdidated his methods as at least effective, the same way Iran vs North Korea is currently showing that you will just be bullied endlessly if you do not posses nuclesr weapons.