My response is that conspiracy theories exist because the event had unexplained or unsatisfactory conclusions. Investigations are supposed to resolve all the issues, and make valid and objective conclusions.
The truth appears that investigations are made to hide the truth and protect someone, or some group.
The 911 commission is a perfect event for generating conspiracy theories. Are conspiracy theories always wrong?
No, they are attempts at filling in the holes left by official reports.
The 911 commission and NIST held a lengthy but unprofessional investigation of the 911 WTC 1,2 and 7 buildings all free falling.
The steel from these building was never tested, and that was one of the failures of the report. Instead, the commission relied on fabricated computer graphics to push their points on how and why the building fell at the speed of gravity.
The steel from the WTC buildings was collected and shipped to China. This is hardly the proper method of investigation. Any way the list goes on, as to how the commission did little to no testing, and yet reported a conclusion.
WTC building 7 was not hit by a plane, and the report suggests that it caught fire from debris form WTC 1 and 2.
Forget the conspiracy theory, the commission didn't explain how three different building, and one that was not hit by planes can fall at the speed of gravity. The fires didn't lat that long, and the heat from the first was well below the melting or even the structural failure of the beams.
No high rise structure has ever failed in this manner from fires before, and now we have three. Without testing how could NIST and the Commission make any valid report.
This is the reason why we have conspiracy theories.