I am. Why would terrorists risk life and limb crossing the Rio Grande or going through dessert areas when they can fly into NYC or Boston on a commercial jet and then move on to whatever destination they choose. Why adopt a Mexican name and persona which just increases your chances of getting caught. They are goign to seem out of place in muslim areas with SPanish names and out of place in Mexican neighborhoods if they cant speak Spanish. I think most people are capable of distinquishing arabs from Mexicans.
I'm guessing, that by your statement, you don't believe our international customs through Airports are any more secure now than they were before 9-11, is that correct?
Well if that's true, then your premise would be valid, because it's not like we had a huge "terrorist watch list" before 9-11.
But in theory, we do now have a huge terrorist watch list at our official airport entry points and hopefully also at our official Canadian and Mexician points of entry (official border crossing points). And if we do, it's possible that a good number of these terrorists or terrorist-wannabes couldn't make it through our official points of entry.
In addition to that, it's possible the terrorists don't want to risk being tracked if they come in via the official points of entry. Aren't we fingerprinting and photographing all foreigners who come in through airports now? Perhaps they are worried about that.
I know if I were going to try to get into Iraq to go pick off a few terrorists, I wouldn't announce myself through official channels. I'd go to a neighboring country and walk in through the desert (so to speak).
I think you're applying too much law-abiding and rational thought to the terrorist mindset. But that's just my opinion, of course.