I don't intend to get involved with this discussion as I am too disgusted with humanity at large to give a shit any more.
The best thing to do is revoke all temporary visas including H1-Bs, students, EVERYONE who is not a citizen, and to conduct THOROUGH interviews with everyone who has been granted a green card within the last five years. I would even consider sending green carders home. The borders must be locked.
BTW, the best way to deliver a bomb is in a Cessna 172. Blast effect depends on airburst. Someone will surely try it someday.
Our civil liberties are gone. Big Brother is here. I resign from humanity.
-ross