I think casting such a wide net dilutes the usefulness of such a list in the first place. With a million names on the list, can it do much more than set off a series of alarms that security learns to ignore? Even U.S. Senator Edward Kennedy has had trouble flying based on his appearance on an airlines watch list. The ticker will hit a million in July.
In September 2007, the Inspector General of the Justice Department reported that the Terrorist Screening Center (the FBI-administered organization that consolidates terrorist watch list information in the United States) had over 700,000 names in its database as of April 2007 - and that the list was growing by an average of over 20,000 records per month.
The uncontroversial contention that Osama Bin Laden and a handful of other known terrorists should not be allowed on an aircraft is being used to create a monster that goes far beyond what ordinary Americans think of when they think about a "terrorist watch list."