Okay, Mullah Omar didn't perpetrate 9/11, he gave shelter to OBL, etc. OBL, is dead. Do you really think it would make any difference to the security of the United States if a caveman who was the strongest war-lord in the world's most backwards country was in our custody? This is an ideology we're fighting and so long as we can keep disrupting their networks and destroying leadership of the affiliates, it makes another attack far less likely. al-Zarcawi and KSM were much bigger "gets" than Mullah Omar, al-Zawahiri, or Abu Yayoub al-Iraqi (or whomever is the figurehead of AQ today).