In the years after 9/11, it wasn't worth the effort to suggest that Iraq didn't have anything to do with the terrorism. The United States did some very bad things based on this big lie. Anyone who tried to raise the issue, while there was still time to do something about it, was shouted down or fired. If you raise the question now people shrug it off. Nothing you can do.
The Internet, which held such promise for opening the world to different ways of thinking, is getting smaller. This is as important as the fight over net neutrality, or NSA surveillance. Our tolerance of ideas that scare us will keep us from solving the problems we have, because that's the mechanism for progress -- listening and understanding new information and points of view.