That and at least a tinge of paranoid personality disorder + living in mom's basement don't know how stuff in the real world works but do watch a lot of movies disorder.
Another is 99 out of 100 pieces of evidence point to explanation A, but conspiracy theorists latch onto the 1 piece that is out of place/doesn't make sense. That becomes their smoking gun. It's like they not only ignore the other 99 point of evidence, but they lack the real world experience to understand that evidence can become garbled. Eyewitness testimony is know to be wildly inaccurate at times. Human memory is imperfect. Some people deliberately make false statement for a host of psychological reasons. Some items reported as facts by one source are reported very differently by another. Conspiracy theorists ignore these realities because they have already made up their minds and are just looking for something ...anything....to proof what they already decided.
Who cares if someone doesn't understand how unique buildings in extremely unique circumstances, collapse? We all saw the airplanes hit the buildings. It is pathologically egotistical to say that just because you don't get how something works, the truth must be some alternative and far fetched story that defies the bulk of the evidence. Yes, yes, yes, some people with a somewhat salient background might support the contrarian story, but they are the minority and we don't know what their motives are. Why assume they are the honest righteous ones and the far greater number of experts are dishonest? Because the outliers confirm the conspiracy theorist's predetermined theory. Ughh….what a mess.
IMO CIA bombs taking down the towers and hitting the Pentagon is as retarded as flat earth. There is no proof of any of that and it defies the evidence that we do have. All we are left with is just the wild imaginations of dolts that don't really know anything the CIA and that can't understand how the buildings pancaked like the condo recently in Florida (fell straight down at the speed of gravity). They just can't accept the solid evidence that building 7 was severely damaged (there's pictures of that for chrissakes) and burned and then collapsed.