Professor Jones stating that laboratory testing has shown samples of the dust that coated NYC on the day contained both unexploded thermite and the product of thermite reaction is not a statement of opinion.
Three buildings collapsing to ground level at near free fall speed is not a statement of opinion.
The destruction of evidence from the event by the FBI is not a statement of opinion.
The claims of 'numerous explosions' are the statements of numerous witnesses.
... When I see all of the above I need no assistance in forming my opinion of what actually took place.