People are often put on the list for even more BS reasons.
I don't doubt that. I don't really like the idea of their "list," but since they have it then everyone else should be pretty much okay.
I guess there is a question of whether government should ever do any preventative investigation?
IIRC, most or all of the 9-11 hijackers were already on a watch list, which is why given seat numbers provided by a flight attendant making an illegal cell phone call, the almighty government was able to attribute the crime to the evil Al Qeada and Osama Bin Ladin within - what, less than 12 hours?