Interesting thread of opinions. At the risk of being labeled a "conspiracy theorist", You might want to do a bit of research on the Patriot Act.. The Act is 350 pages that updates more than 50 federal statutes and uses the term "acts of terrorism" countless times.
According to the Patriot Act, if you are charged with suspicion of an act of terrorism, the authorities (the word "authorities" is undefined and could include anyone considered in a position of authority, right down to a teacher at school, in an extreme case) could, theoretically, detain a person indefinitely, without the right to a phone call, or the opportunity to speak to a lawyer, or even the right to trial. If you are suspected of a terrorist act, under the Patriot Act, all your assets can be seized, your children taken, and you could be potentially locked up for life without ever being tried at all. This could also happen if you're charged with conspiracy to commit terroristic acts. Having a cup of coffee with someone being watched automatically creates reasonable cause, whether you know this guy or just met him.
Sounds serious, huh?
The most frightening thing in the whole document is that nowhere in the document does it actually define the words "terrorism" or "terroristic act". Without a clear definition this leaves everything wide open to interpretation. Mouth off to a cop, and have that cop decide to really make a bad day for you, he can just file you in under suspicion. You don't even get to call Mom for bail, cause there isnt any. See ya in twenty, maybe.
I know this is extreme, but actually quite plausible. No suspicion of conspiracy, this is pure, disturbing fact. A fact that the American people allowed to happen under the guise of "Homeland Security".
Good luck finding a proper definition to terrorist, it seems even the Congress of the United States, and even the President can't define it, either.