John9001,
What don't you understand about what I mean? The phrase "common knowledge" implies a knowledge that is shared by many people, not just one. I believe it is false knowledge, though -- hence the quote from the Wizard of Oz, which asks people to disregard what they see and continue to believe a fantasy.
In the words of former White House counterterrorism director Richard Clark,
Of course, nothing about our being “over there” in any way prevents terrorists from coming here. Quite the opposite, the evidence is overwhelming that our presence provides motivation for people throughout the Arab world to become anti-American terrorists.
I would think the soundness of his logic has been adequately pointed out today.