I've addressed the motive in another subthread.

As to the design flaw, yes, it's hypothetical, as is the debris falling across the street and through the concrete wall in the middle of the building, as is the fuel system even having any fuel in it, etc.

I certainly sympathize with your complaint about noise as it applies to conspiracy theories in general, this is indeed problem #1. Massive, massive amounts of red herrings. I think this summary is fairly clean of it, but if you have specific complaints I'd be happy to hear them.