another brilliant xkcd comic
I couldn’t agree more.
I think it’s safe to say that nobody ever looked into 9/11 conspiracy theories or creationism undecided and came out in favour. There’s not really any point in arguing with these people — while they like to surround their arguments with fact-like substances, that serves a psychological, not rational purpose. At the end of the day, they’ve chosen to live in a fantasy world where the facts meet their preconceptions.
Not that conspiracy theorists and creationists are irredeemable — just reason-proof. They need to change the way they think before they can change their minds.