After watching the series 24 and Jericho, got me to rethink one very important terror threat issue America is facing and no one politician like to talk about: Terrorists like Timothy McVeigh. The future home brew terrorists may not be motivated by idealism nor religion but rather greed, anger on integrity of bureaucrat, personal gain from the general public pain and lost. 
You may think it's just TV sitcom fantasies, but if you carefully observed at corporations such as Carlyle Group and Haiburton, their link and relation with terrorist supporters are actually very real and get away with it. Imagine one day in the future when the world terrorists quit like IRA moving toward main stream for a peaceful solution?
American  Arm dealers and weaponries producing firms' business busted  because of no war, and turn inward to stir up war inside the country by fuming up ideology between ultra right-wingers and ultra liberals, American Taliban like religious fanatics vs atheists, and worst of it kind is some evil minded creating opportunity to make $billions by organize large group of criminals to nuke almost every America infrastructure and  Govt offices at once like show in 'Jericho'...

Just the thought of it, I got goose bumps all over me. I think homeland security and CIA should take such thing more serious than outside invaders because these invisible criminals are mostly likely a Caucasian &  harder to detect due to the fact he/she may be your next door good decent normal neighbor, a politician, a wealthy businessman, a corporation CEO etc. .