Do you seriously think the only evidence linking UBL to 911 is a single video?
The US captured hundreds of enemy combatants and interrogated them all. A lot of them mention and talk about UBL and the role he played pre and post-911.
"Do you seriously think the only evidence linking UBL to 911 is a single video?"
Can you link me to where on the web it is that the U.S. government has outlined the main evidence that OBL was behind 9/11? Because the official FBI page does not even list him as a suspect in the attacks:
The US captured hundreds of enemy combatants and interrogated them all. A lot of them mention and talk about UBL and the role he played pre and post-911.
Try reading wikileaks.