And to try and disassociate terrorism from illegal immigration is fully dishonest, or at the very least, horribly naive. Yah, the planes were hijacked by folks that were here legally (at least at some point) but what is going to happen once you cut off that route? They're going to come in over the border, be it North or South. And no amount of pilot arming and/or background checking is going to stop them. Of course, once we come to the conclusion that our borders are built like seives we will attemt to effect a real border scheme. But, by then it'll be too late.
EBUCK
And the fourth wave will be American citizens.
You can put a wall around tnis country, and still not prevent terrorists from getting in.
Seriously, how is this qualitatively different from the guns/crime debate?