Obstruction of justice
Yes, sometimes it is the most important visible issue.
“The principal conclusion of our study is that fire did not cause the collapse of WTC 7 on 9/11, contrary to the conclusions of NIST and private engineering firms that studied the collapse. The secondary conclusion of our study is that the collapse of WTC 7 was a global failure involving the near-simultaneous failure of every column in the building.”
“As Table 2.3 illustrates, we took several steps in our modeling of WTC 7 that NIST did not take. These steps enabled us to more accurately simulate the building’s behavior and to consider conflicting assumptions regarding the as-built condition of the building.”
“It is our conclusion that the collapse of WTC 7 was a global failure involving the near-simultaneous failure of all columns in the building and not a progressive collapse involving the sequential failure of columns throughout the building.
Despite simulating a number of hypothetical scenarios, we were unable to identify any progressive sequence of failures that could have taken place on September 11, 2001, and caused a total collapse of the building, let alone the observed straight-down collapse with approximately 2.5 seconds of free fall and minimal differential movement of the exterior.”
– J. Leroy Hulsey, University of Alaska, Fairbanks