> some of the terrorists in fact WERE here on expired visas and such?

Yes, according to what I have heard, 4 of the 19 were on expired visas. I see no justification for this kind of roundup based on that reason, as most were legal. Besides, a good portion of people with expired visas in this country are there because the INS can't get it's act together and sent them renewals in a timely matter.