The FBI needs to get on the case.
I wish the FBI would. However terrorism is only a crime after U.S. citizens have been murdered. You can't throw a person in jail for wanting to learn how to pilot jumbo passenger jets (but not how to take off and land). Even more so, you cannot profile a person because he's of middle eastern extraction or speaks Arabic.
There have been several FBI agents at district field offices who have made those mistakes -- and reported their suspicions to higher-ups in Washington. They are no longer in the service of the FBI.