What we did know wouldn't have helped in this "Politically Correct" culture. Imagine a memo from FBI Director, Robert Mueller, to American airports and the FAA ..."Twenty or so Middle Eastern men, who were learning to fly in American flight schools, are perceived to be Bin Laden terrorists. It is thought that they are planning to hijack commercial airliners. Please detain, question, and search ALL Middle Eastern men until further notice." There would have been more of an explosion from this memo than the actual World Trade Center and Pentagon bombings!
Can you imagine the political and human fallout from this? We would hear from every organization from the NAACP, ACLU, NCAA, KKK, Ralph Nader, Jesse Jackson, Jane Fonda, and Bono.
I know it's dated, but I'll have an eye out for his next article.