Because they want to be fooled.

Granted, as many in this thread have already observed with the subject of masks, there are many who have simply surrendered critical thinking to their television.

But there are many people who are reasonably good critical thinkers that blanche at talk of 9/11 being an inside job. They want to believe the narrative because the alternative is a world that's too scary for them to comfortably live in.

I know of patriotic individuals who have become openly hostile to me (including one of my brothers) when talking 9/11 truth. They're afraid and fear leads to bad decisions and living in a comforting fantasy land.