people become conspiracy theorists because the want to be in a little niche crowd of "in the know" people.
It starts when they stumble upon some 9/11 stuff on the web or listen to someone spouting off about it, they ask questions and get told to "do your own research" then inevitably they type in things like 9/11 conspiracy and then are led on a wild goose chase of nonsensical websites that offer nothing as evidence(its because there is none)
They call everyone else sheep for not believing the stuff they have read that isn't backed by anything tangible, the irony is unbelievable.
They have nothing to give to skeptics because they couldn't find anything themselves so they parrot the same "do your own research"
They do finally come back down to earth eventually, until then its just best to back away smiling and nodding when they approach you with their buffoonery.
Tip for 9/11 researchers, just type in "9/11 debunked", there is far more stuff to read in their based on science.