"I don't need to look at the evidence." "I wouldn't believe it even if it WERE true." "I refuse to believe that that many Americans could be that satanically treasonous. Someone would have talked." These are beliefs. They are not scientific facts. But, these beliefs do keep us from looking at the empirical evidence. In this video, psychologists explain the pyschological and emotional barriers to looking at 9/11 with a critical eye.