Like racial profiling, the so-called Watch List hinges on a false premise that people commit crimes because of their racial, ethnic or religious background. This false premise caused huge suffering to African America, Japanese Americans and now Arab and American Muslims. The worst part of this is the assumption that practicing Islam, never mind being an activist at that, gives one an appetite for terrorism. In the process, people who are in good standing who did not commit nor had a criminal record are treated as "posing a threat to civil aviation or national security" or as "potential enemies of the state".
Karen DeYoung of the Washington Post reported last year that since 2003, a database that stores names of "individuals that the intelligence community believes might harm the United States" has quadrupled from 100,000 to 435,000. I am sure the numbers now are way higher. The question is that if the US has these many "terrorists" or "dangerous people," then we have a real and huge problem that cannot be solved by a watch list that selectively targets people.