The 9/11 Commissioners publicly expressed anger at cover ups and obstructions of justice by the government into a real 9/11 investigation:

9/11 Commission co-chair Lee Hamilton says "I don't believe for a minute we got everything right", that the Commission was set up to fail, that people should keep asking questions about 9/11, and that the 9/11 debate should continue.

The 9/11 Commission chair said the Commission was "set up to fail"

The Commission's co-chairs said that the CIA (and likely the White House) "obstructed our investigation"

9/11 Commissioner Bob Kerrey said that "There are ample reasons to suspect that there may be some alternative to what we outlined in our version . . . We didn't have access . . . ."

9/11 Commissioner Timothy Roemer said "We were extremely frustrated with the false statements we were getting"