“There is no hard evidence linking Bin Laden to the attacks of 9/11”. -FBI
Of course, there is no evidence for KSM’s involvement either. He was tortured more than 100 times over the course of a month. The 9/11 commission had no access to him, not even his “interview” transcripts. Everything we know is from the mouths of the CIA agents who interrogated him, who admitted that he was completely unreliable.