"What about the absolutely irrefutable fact, shown in a conspiracy theory video, that the hole in the Pentagon was shaped nothing nothing like the wings and fuselage of a jetliner?"

Oh, I HOPE you are kidding. It has been explained 6 ways from Sunday why you don't see a wing shaped holes in the Pentagon...like you would in a cartoon.

***"Wings are fragile and break off. They have MUCH less mass than the basic bulk of the plane." ***

They DID find small pieces of wings....a couple with identifiable markings.
What one needs to do is LOOK at the images of various plane parts, both on the lawn, and inside the building and read the eyewitness reports of those who SAW the plane.....then work backwards KNOWING that it waqs a plane. This is what the 'real' experts did.