My cnclusion at the end of multiple evidence presenting and to and froing with my conspiracy mates is that the conspiracy theorist will search out evidence from every crackpot source to back up their theories.
Take for example, the no planes theory into the WTC. It wasn't taken from a helicopter thing. Lenses are image stabilized and can look very stable. The different view points were more than .2 of a degree apart as stated and a whole lot of a different alitude. Working out visual angles is part of my professsion and it was obvious to me, but not to someone that is open to being herded into the conspiracy space.
I'm sorry, you will believe what you want, but the 9/11 CIA thing goes with the so called fake moon landing and hanger 9 flying saucer/ hidden martian thing.