1. the people who carried out the attacks are dead;
2. the organisation who planned the attacks is smashed;
3. the country where the attacks were planned is rubble;
so that's hardly sitting around and twiddling your thumbs. I think really what this thread is about is good ol' venting; California-style 'express yourself' and 'let it all out' therapy. Which I guess can't hurt. But let's be clear; should the original proposal (to deport all aliens) ever be enacted it would be like pouring gasoline on the smouldering embers of terrorism.
Those 19 did not pay their own room and board, they didn't pay their own tuition to flight schools and colleges. The Muslim terrorists living in the US are a well-financed group and much of their money is coming from US mosques. The average Muslim may or may not know they contribute to terrorism through their "charities". Back in 1998, it was estimated there were 1500 to 2000 known terrorists living in the US. "Jihad in America" is a good video to watch to learn more what the FBI knew all along.